Citation

Balmford, J., Borland, R., Hammond, D., Cummings, K.M. (2011). Adherence to and reasons for premature discontinuation from stop-smoking medications: Data from the ITC Four-Country Survey. Nicotine & Tobacco Research, 13(2), 94-102.

Abstract

Introduction: Nicotine replacement therapies (NRTs) have been demonstrated to be effective in clinical trials but may have lower efficacy when purchased over-the-counter (OTC). Premature discontinuation and insufficient dosing have been offered as possible explanations. The aims are to (a) investigate the prevalence of and reasons for premature discontinuation of stop-smoking medications (including prescription only) and (b) how these differ by type, duration of use, and source (prescription or OTC).

Methods: The sample includes 1,219 smokers or recent quitters who had used medication in the last year (80.5% NRT, 19.5% prescription only). Data were from Waves 5 and 6 of the International Tobacco Control (ITC) Four-Country Survey.

Results: Most of the sample (69.1%) discontinued medication use prematurely. This was more common among NRT users (71.4%) than in users of bupropion and varenicline (59.6%). OTC NRT users were particularly likely to discontinue (76.3%). Relapse back to smoking was the most common reason for discontinuation of medication reported by 41.6% of respondents. Side effects (18.3%) and believing that the medication was no longer needed (17.1%) were also commonly reported. Of those who completed treatment, 37.9% achieved 6-month continuous abstinence compared with 15.6% who discontinued prematurely. Notably, 65.6% who discontinued because they believed the medication had worked were abstinent.

Conclusions: Premature discontinuation of stop-smoking medications is common but is not a plausible reason for poorer quit outcomes for most people. Encouraging persistence of medication use after relapse or in the face of minor side effects may help increase long-term cessation outcomes.

Citation

Borland, R., Cooper, J., McNeill, A., O’Connor, R.J., Cummings, K.M. (2011). Trends in beliefs about the harmfulness and use of stop-smoking medications and smokeless tobacco products among cigarettes smokers: Findings from the ITC Four-Country Survey. Harm Reduction Journal, 8(1), 21-31.

Abstract

Background: Evidence shows that smokers are generally misinformed about the relative harmfulness of nicotine, and smokeless forms of nicotine delivery in relation to smoked tobacco. This study explores changing trends in the beliefs about the harmfulness and use of stop smoking medications and smokeless tobacco in adult smokers in four countries where public education and access to alternative forms of nicotine is varied (Canada, the US, the UK and Australia).

Methods: Data are from seven waves of the ITC-4 country study conducted between 2002 and 2009 with adult smokers from Canada, the US, the UK and Australia. For the purposes of this study, data were collected from 21,207 current smokers. Using generalised estimating equations to control for multiple response sets, multivariate models were tested to look for main effects of country, and trends across time, controlling for demographic variables.

Results: Knowledge remained low in all countries, although UK smokers tended to be better informed. There was a small but significant improvement across time in the UK, but mixed effects in the other three countries. At the final wave, between 37.5% (US) and 61.4% (UK) reported that NRT is a lot less harmful than cigarettes. In Canada and the US, where smokeless tobacco is marketed, only around one in six believed some smokeless tobacco products could be less harmful than cigarettes.

Conclusions: Many smokers continue to be misinformed about the relative safety of nicotine and alternatives to smoked tobacco, especially in the US and Canada. Concerted efforts to educate UK smokers have probably improved their knowledge. Further research is required to assess whether misinformation deters smokers from appropriate use of alternative forms of nicotine.

Citation

Fix, B.V., Hyland, A., Rivard, C., McNeill, A., Fong, G.T., Borland, R., Hammond, D., Cummings, K.M. (2011). Usage patterns of stop smoking medications in Australia, Canada, the United Kingdom, and the United States: Findings from the 2006-2008 International Tobacco Control (ITC) Four Country Survey. International Journal of Environmental Research and Public Health, 8(1), 222-233.

Abstract

Varenicline is a new prescription stop smoking medication (SSM) that has been available in the United States since August 1, 2006, in the United Kingdom and other European Union countries since December 5, 2006, in Canada since April 12, 2007, and in Australia since January 1, 2008. There are few population-based studies that have examined use rates of varenicline and other stop smoking medications. We report data from the ITC Four Country survey conducted with smokers in the US, UK, Canada, and Australia who reported an attempt to quit smoking in past year in the 2006 survey (n = 4,022 participants), 2007 (n = 3,790 participants), and 2008 surveys (n = 2,735 participants) Respondents reported use of various stop smoking medications to quit smoking at each survey wave, along with demographic and smoker characteristics. The self-reported use of any stop smoking medication has increased significantly over the 3 year period in all 4 countries, with the sharpest increase occurring in the United States. Varenicline has become the second most used stop smoking medication, behind NRT, in all 4 countries since being introduced. Between 2006 and 2008, varenicline use rates increased from 0.4% to 21.7% in the US, 0.0% to 14.8% in Canada, 0.0% to 14.5% in Australia, and 0.0% to 4.4% in the UK. In contrast, use of NRT and bupropion remained constant in each country. Males and non-whites were significantly less likely to report using any SSM, while more educated smokers were significantly more likely to use any SSM, including varenicline. Our findings suggest that the introduction of varenicline led to an increase in the number of smokers who used evidence-based treatment during their quit attempts, rather than simply gaining market share at the expense of other medications. From a public health perspective, messages regarding increased success rates among medication users and the relative safety of stop smoking medications should be disseminated widely so as to reach all smokers of all socioeconomic classifications equally.

Citation

King, B., Hyland, A., Borland, R., McNeill, A., Cummings, K.M. (2011). Socioeconomic variation in the prevalence, introduction, retention, and removal of smoke-free policies among smokers: Findings from the International Tobacco Control (ITC) Four Country Survey. International Journal of Environmental Research and Public Health, 8(2), 411-434.

Abstract

Introduction: Exposure to secondhand smoke causes premature death and disease in non-smokers and indoor smoke-free policies have become increasingly prevalent worldwide. Although socioeconomic disparities have been documented in tobacco use and cessation, the association between socioeconomic status (SES) and smoke-free policies is less well studied.

Methods: Data were obtained from the 2006 and 2007 Waves of the International Tobacco Control Four Country Survey (ITC-4), a prospective study of nationally representative samples of smokers in Canada, the United States, the United Kingdom, and Australia. Telephone interviews were administered to 8,245 current and former adult smokers from October 2006 to February 2007. Between September 2007 and February 2008, 5,866 respondents were re-interviewed. Self-reported education and annual household income were used to create SES tertiles. Outcomes included the presence, introduction, and removal of smoke-free policies in homes, worksites, bars, and restaurants.

Results: Smokers with high SES had increased odds of both having [OR: 1.54, 95% CI: 1.27–2.87] and introducing [OR: 1.49, 95% CI: 1.04–2.13] a total ban on smoking in the home compared to low SES smokers. Continuing smokers with high SES also had decreased odds of removing a total ban [OR: 0.44, 95% CI: 0.26–0.73]. No consistent association was observed between SES and the presence or introduction of bans in worksites, bars, or restaurants.

Conclusions: The presence, introduction, and retention of smoke-free homes increases with increasing SES, but no consistent socioeconomic variation exists in the presence or introduction of total smoking bans in worksites, bars, or restaurants. Opportunities exist to reduce SES disparities in smoke-free homes, while the lack of socioeconomic differences in public workplace, bar, and restaurant smoke-free policies suggest these measures are now equitably distributed in these four countries.

Citation

Gibson, J.E., Murray, R.L., Borland, R., Cummings, K.M., Fong, G.T., Hammond, D., McNeill, A. (2010). The impact of the United Kingdom's national smoking cessation strategy on quit attempts and use of cessation services: Findings from the International Tobacco Control Four Country Survey. Nicotine & Tobacco Research, 12(Suppl 1), S64-71.

Abstract

Introduction: The World Health Organization Framework Convention on Tobacco Control recommends that provision of cessation support should be included in national tobacco control strategies. This study examines the impact of the United Kingdom’s national smoking cessation strategy on quit attempts, use of treatment and short-term abstinence, relative to the United States, Canada, and Australia where less support is provided.

Methods: Data on quitting behavior and use of support were obtained for all smokers enrolled in the International Tobacco Control 4 Country Survey between 2002 and 2005. Generalized estimating equations were used to calculate the relative odds (adjusted by age, sex, and Heaviness of Smoking Index) that smokers in each country made quit attempts, used behavioral or pharmacological support, and to compare rates of short-term (28 days) abstinence between countries and users of different forms of support.

Results: U.K. smokers were less likely to have attempted to quit smoking than those in Australia (odds ratio [OR] = 1.25, 95% CI: 1.12–1.40), Canada (OR = 1.50, 95% CI: 1.34–1.67), and the United States (OR = 1.25, 95% CI: 1.11–1.40) but were more likely to use pharmacotherapy and/or support from a clinic, helpline, or health professional when attempting to quit than smokers in the other countries. U.K. smokers making quit attempts were significantly more likely to achieve 28-day abstinence than those in Australia (OR = 0.59, 95% CI: 0.49–0.71), Canada (OR = 0.72, 95% CI: 0.61–0.87), and the United States (OR = 0.51, 95% CI: 0.42–0.62).

Conclusions: U.K. smokers report fewer quit attempts but are more likely to use support when quitting and to achieve short-term abstinence.

Citation

Reid, J., Hammond, D., Boudreau, C., Fong, G.T., Siahpush, M. (2010). Socioeconomic disparities in quit intentions, quit attempts, and smoking abstinence among smokers in four western countries: Findings from the International Tobacco Control Four Country Survey. Nicotine & Tobacco Research, 12(Suppl 1), S20-33.

Abstract

Introduction: Lower socioeconomic status (SES) groups have higher rates of tobacco use, are less likely to successfully quit, and may also be less likely to intend or attempt to quit. However, results are inconsistent for some outcomes, and little is known about how socioeconomic disparities vary across countries and over time.

Methods: This study examined the associations between SES and quitting-related behaviors among representative samples of smokers in Canada, the United States, the United Kingdom, and Australia, using data from the first five waves (2002–2006/2007) of the International Tobacco Control Four Country Survey (35,532 observations from 16,458 respondents). Generalized estimating equations modeling was used to examine whether education and income were related to intentions to quit, incidence of quit attempts, and smoking abstinence. Potential differences in the associations over time and across countries were also considered.

Results: Smokers with higher education were more likely to intend to quit, to make a quit attempt, and to be abstinent for at least 1 and 6 months; smokers with higher income were more likely to intend to quit and to be abstinent for at least 1 month. Some between-country differences were observed: U.K. and U.S. smokers were less likely to intend to quit than Australians and Canadians; and, although U.K. respondents were least likely to attempt to quit, those that did were more likely to be abstinent.

Discussion: The results suggest that socioeconomic disparities exist at multiple stages in the path to smoking cessation. Potential effects on socioeconomic disparities should be considered when implementing cessation interventions.

Citation

Cooper, J., Borland, R., Yong, H.H., McNeill, A., Murray, R.L., O’Connor, R.J., Cummings, K.M. (2010). To what extent do smokers make spontaneous quit attempts and what are the implications for smoking cessation maintenance? Findings from the International Tobacco Four Country Survey. Nicotine & Tobacco Research, 12(Suppl 1), S51-57.

Abstract

Aim: To assess the extent to which quit attempts are spontaneous and to evaluate if this is a determinant of smoking cessation maintenance, with better control for memory effects.

Methods: We use data from 3,022 smokers who made quit attempts between Waves 4 and 5 and/or Waves 5 and 6 of the International Tobacco Control Four country survey. Outcomes (quitting for 6 months) were confirmed at the next wave for cases where the attempt began within the previous 6 months. We assessed the length of delay between the decision to quit and implementation and whether the attempt followed a “spur-of-the-moment” decision or some serious prior consideration. Outcomes were modeled using generalized estimating equations.

Results: Prior consideration of quitting was unrelated to the outcome, but there were complex relationships for the delay between choosing a quit day and implementation. Those who reported quitting on the day they decided and those who delayed for 1 week or more had comparable rates of 6-month abstinence. Delaying for 1–6 days was associated with a greater relapse rate than those who quit on the day, although this effect became non-significant in multivariate analyses.

Conclusions: Quitting is on most smokers’ minds regularly and most attempts are not preceded by a long lead in period following the decision to try. Neither prior consideration nor delay between the decision to quit and implementation was clearly related to outcomes. Previous findings of greater success for spontaneous quit attempts may be because they conflate setting a date in advance with planning and also perhaps some differential memory effects.

Citation

Cooper, J., Borland, R., Yong, H.H., Hyland, A. (2010). Compliance and support for bans on smoking in licensed venues in Australia: Findings from the International Tobacco Control Four Country Survey. Australian and New Zealand Journal of Public Health, 34(4), 379-385.

Abstract

Objective: To examine attitudes towards and compliance with the recent Australian bans on smoking in licensed venues, and to explore effects on smoking behaviour.

Methods: Three Australian states (Queensland, Tasmania and Western Australia) implemented a total ban on smoking in all enclosed licensed premises in 2006, and two others (Victoria and New South Wales) did so in mid-2007. We used data from smokers residing in these states for each of the six waves of the ITC-4 country survey (2002-2007; average n=1,694).

Results: Consistent with the majority of international findings, observed compliance was reported by more than 90% of smokers from a pre-ban situation of indoor smoking being the norm. Attitudes became more positive in the year before the ban, but more than doubled in the year the bans were implemented. The associations found for the leading states were replicated by the lagging states a year later. We found no evidence for any increase in permitting smoking inside the home after the bans took effect. Further, we were unable to find any evidence of reductions in daily cigarette consumption or any increase in quitting activity due to the bans.

Implications: These results add to a growing body of international research that suggests that smokers are readily able to comply with, and increasingly support, smoke-free bars, though the bans may have limited effect on their smoking habits.

Citation

Fix, B.V., O’Connor, R.J., Hammond, D., King, B., McNeill, A., Thrasher, J.F., Boado Martinez, M., Cummings, K.M., Yong, H.H., Thompson, M.E., Hyland, A. (2010). ITC spit and butts pilot study: The feasibility of collecting saliva and cigarette butt samples from smokers to evaluate policy. Nicotine & Tobacco Research, 12(3), 185-190.

Abstract

Introduction: Large-scale epidemiological surveys have frequently relied upon clinic-based sample collection to incorporate biological data, which can be costly and result in non-representative data. Collecting samples in a nonclinical setting (i.e., through postal mail or at the subject’s home) offers an alternative option that is minimally invasive and can be incorporated into large population-based studies.

Objectives: (a) To assess the feasibility of collecting biological data from a cohort of smokers in the International Tobacco Control (ITC) study, through the mail and in the home; (b) to examine whether participants are representative of the population under consideration; and (c) to evaluate how the added burden of providing biomarker samples might impact subsequent participation in a follow-up survey.

Methods: Participants were asked to provide a saliva sample and five cigarette butts from cigarettes smoked on a single day, using standardized procedures. Sample collection kits were mailed to a random sample of 400 daily cigarette smokers who were involved in the 2006 annual ITC Four Country (United Kingdom, United States, Canada, and Australia) telephone survey and agreed to participate in sample collection. A random sample of 179 daily smokers who participated in a face-to-face ITC survey in Mexico and Uruguay and agreed to participate in sample collection were also asked to provide samples.

Results: Samples were collected from 96% of invited participants in the face-to-face surveys and 52% of participants in the telephone survey. The added burden of the sample collection did not reduce survey retention rates. Participants who initially agreed to participate in the sample collection were more likely to participate in the subsequent survey than participants who were not asked or declined to participate (odds ratio [OR] = 1.28; 95% CI = 1.01–1.62, p = .021). Further, those who provided samples were also more likely to participate in the subsequent survey than those who did not (OR = 2.78; 95% CI = 1.71–4.52, p < .001).

Discussion: Collecting saliva and cigarette butt samples from a group of smokers is feasible, yields a representative sample, and the added participant burden does not reduce subsequent survey response rates.

Citation

Kahler, C.W., Borland, R., Hyland, A., McKee, S., O’Connor, R.J., Fong, G.T., Cummings, K.M. (2010). Quitting smoking and change in alcohol consumption in the International Tobacco Control (ITC) Four Country Survey. Drug and Alcohol Dependence, 110(1-2), 101-107.

Abstract

Although frequent heavy drinking has been associated with decreased odds of quitting smoking, the extent to which smoking cessation is associated with decreased alcohol consumption is less clear. The present study examined over a 2-year period whether individuals who quit smoking for at least 6 months, compared to those making a quit attempt but continuing to smoke and to those not making any attempt to quit smoking, showed greater reductions in drinking frequency, average weekly quantity of alcohol consumption, and frequency of heavy drinking. Data were drawn from the International Tobacco Control Four Country Survey, a prospective cohort study of smokers in Australia, Canada, the UK, and the US. A total of 3614 participants provided alcohol data at one study wave and were re-interviewed 2 years later regarding smoking and alcohol use. Consistent with prior studies, individuals who drank heavily (4+/5+ drinks for women and men, respectively) more than once a week had especially low rates of quitting smoking. There was little evidence, however, that those who achieved sustained smoking cessation made greater reductions in drinking compared to those who continued to smoke. These results were consistent across countries and sexes and did not differ significantly by heaviness of smoking. Results indicate that quitting smoking, in and of itself, does not lead to meaningful changes in alcohol use. Therefore, interventions and policies directed towards increasing smoking cessation are unlikely to affect rates of hazardous drinking unless they include specific elements that address alcohol consumption.

Citation

Hitchman, S.C., Fong, G.T., Borland, R., Hyland, A. (2010). Predictors of smoking in cars with nonsmokers: Findings from the 2007 Wave of the International Tobacco Control Four Country Survey. Nicotine & Tobacco Research, 12(4), 374-380.

Abstract

Objective: This study examines the proportion and characteristics of smokers who smoke in cars with nonsmokers across four countries and the potentially modifiable correlates of this behavior.

Methods: Respondents included a total of 6,786 current adult smokers from Wave 6 (September 2007– February 2008) of the International Tobacco Control Four Country Survey, a random digit-dial telephone survey of nationally representative samples of adult smokers in Australia, the United Kingdom, Canada, and the United States.

Results: Reports of smoking in cars with nonsmokers ranged from a low of 29% in Australia and the United Kingdom, to 34% in Canada, and to a high of 44% in the United States. Daily smokers who were from the United States, male, and younger were the most likely to smoke in cars with nonsmokers. Several potentially modifiable factors were also found to be related to this behavior, including smoke-free homes and beliefs about the dangers of cigarette smoke exposure to nonsmokers.

Conclusions: A considerable proportion of smokers continue to smoke in cars with nonsmokers across the four countries, particularly in the United States. Public health campaigns should educate smokers about the hazards of cigarette smoke exposure and promote the need for smoke-free cars. These findings provide a foundation of evidence relevant for jurisdictions

Citation

Borland, R., Yong, H.H., Balmford, J., Cooper, J., Cummings, K.M., O’Connor, R.J., McNeill, A., Zanna, M.P., Fong, G.T. (2010). Motivational factors predict quit attempts but not maintenance of smoking cessation: Findings from the International Tobacco Control Four Country Project. Nicotine & Tobacco Research, 12(Suppl 1), S4-11.

Abstract

Aim: To explore whether measures of motivation to quit smoking have different predictive relationships with making quit attempts and the maintenance of those attempts.

Methods: Data are from three wave-to-wave transitions of the International Tobacco Control Four (ITC-4) country project. Smokers' responses at one wave were used to predict the likelihood of making an attempt and among those trying the likelihood of maintaining an attempt for at least a month at the next wave. For both outcomes, hierarchical logistic regressions were used to explore the predictive capacity of seven measures of motivation to quit smoking, controlling for a range of other known or possible predictors.

Results: Bivariate analyses indicate that measures of motivation to quit are predictive of making quit attempts, but they predict relapse among those making attempts. Multivariate analyses identified wanting to quit and frequency of prematurely butting out cigarettes as the main positive predictors of making attempts, but this was reduced by intention and recency of last attempt. For maintenance, premature butting out was the main motivation variable predicting relapse and was essentially unaffected by other measures.

Discussion: The findings show that it is wrong to suggest that all one needs to quit is to be motivated to do so. The reality is that one needs to be motivated to prompt action to stop smoking, but this is not sufficient in and of itself to ensure that cessation is maintained. These findings call attention to the importance of understanding the differential roles that prequit and postquit experiences play in smoking cessation and of providing help to smokers to stay off cigarettes.

Citation

Borland, R., Yong, H.H., O’Connor, R.J., Hyland, A., Thompson, M.E. (2010). The reliability and predictive validity of the Heaviness of Smoking Index and its two components: Findings from the International Tobacco Control Four Country Study. Nicotine & Tobacco Research, 12(Suppl 1), S45-50.

Abstract

Background: There is increasing recognition that the two measures in the Heaviness of Smoking Index (HSI), time to first cigarette of the day (TTFC) and daily consumption (cigarettes per day [CPD]), are strong predictors of quitting behavior.

Methods: Use of Waves 1-4 of International Tobacco Control cohort with around 8,000 respondents per wave and 6,000 for prediction of quit outcomes at the next wave. We measured TTFC and CPD at each wave and quit outcomes at the next wave. We also looked at the relative utility of the standard categorical scoring compared with a continuous score using the square root of CPD minus the natural log of TTFC in minutes.

Results: We found considerable consistency of the measures across years with a small decrease as duration between measurements increased. For a 3-year gap, the correlations were .72 and .70 for the continuous and categorical composite HSI measures, respectively, and were at least .63 for the individual components. Both TTFC and CPD independently predicted maintenance of quit attempts (for at least 1 month) in each of the three wave-to-wave replications, and these effects were maintained when controlling for demographic factors. CPD also predicted making attempts consistently, but the results for TTFC was not consistently significant.

Discussion: Both TTFC and CPD are fairly reliable over time and are important predictors of quitting. There are only small effects of mode of computing the scores, and the two items can be used either individually or combined as the HSI.

Citation

Siahpush, M., Yong, H.H., Borland, R., Reid, J. (2010). Socioeconomic position and abrupt versus gradual method of quitting smoking: Findings from the International Tobacco Four Country Survey. Nicotine & Tobacco Research, 12(Suppl 1), S58-63.

Abstract

Introduction: Our aim was to investigate the association between socioeconomic position (income and education) and abrupt versus gradual method of smoking cessation.

Methods: The analysis used data (n = 5,629) from Waves 1 through 6 (2002–2008) of the International Tobacco Control Four-Country Survey, a prospective study of a cohort of smokers in the United States, Canada, the United Kingdom, and Australia.

Results: Logistic regression analyses using generalized estimating equations showed that higher income (p < .001) and higher education (p = .011) were associated with a higher probability of abrupt versus gradual quitting. The odds of adopting abrupt versus gradual quitting were about 40% higher among respondents with high income ($60,000 and more in the United States/Canada/Australia and £30,000 and more in the United Kingdom) compared with those with low income (less than $30,000 in the United States/Canada/Australia; £15,000 and less in the United Kingdom). Similarly, the odds of abrupt versus gradual quitting were about 30% higher among respondents with a high level of education (university degree) compared with those with a low level of education (high school diploma or lower).

Discussion: Higher socioeconomic position is associated with a higher probability of quitting abruptly rather than gradually reducing smoking before quitting.

Citation

Yong, H.H., Borland, R., Cooper, J., Cummings, K.M. (2010). Postquitting experiences and expectations of adult smokers and their association with subsequent relapse: Findings from the International Tobacco Control (ITC) Four Country Survey. Nicotine & Tobacco Research, 12(Suppl 1), S12-19.

Abstract

Introduction: This paper explores postquitting experiences and expectations of adult ex-smokers and their utility as predictors of smoking relapse after prolonged abstinence.

Methods: Data are from 1,449 ex-smokers (providing 2,234 observations) recruited as smokers as part of the International Tobacco Control (ITC) Four Country Survey (Australia, Canada, the United Kingdom, and the United States) but surveyed after they had quit. Controlling for length of time quit, reported postquitting experiences, and expectations assessed at one of three waves were used as predictors. Smoking status (whether they had relapsed) at the next wave was used as the outcome of interest.

Results: Postquitting experiences and expectations, such as capacity to enjoy life’s simple pleasures, ability to cope with stress, ability to control negative emotions, and health concerns, changed systematically over time but at different rates. The trajectory of change for life enjoyment and health concerns followed a rapidly asymptoting logarithmic function, while that of stress and negative affect coping followed a slower asymptoting square root function. After controlling for sociodemographic and abstinence duration, only reported decline in capacity to control negative affect since quitting was associated with increased relapse risk.

Discussion: The varying patterns of change in postquitting experiences suggest that psychological gains over time following smoking cessation do not all occur at the same rate. The relative importance of each factor in maintaining abstinence is also not the same with deficits in perceived control of negative emotions being the only one predictive of subsequent relapse. Strategies to improve impulse control over negative emotions postquitting may help to reduce relapse risk.

Citation

O'Connor, R. J., Fix, B. V., Hammond, D., Giovino, G. A., Hyland, A., Fong, G. T., & Cummings, K. M. (2010). The impact of reduced ignition propensity cigarette regulation on smoking behaviour in a cohort of Ontario smokers. Injury prevention : journal of the International Society for Child and Adolescent Injury Prevention, 16(6), 420–422. https://doi.org/10.1136/ip.2009.025114

Abstract

This study examined the degree to which legislation intended to reduce the incidence of cigarette-caused fires influenced the behaviours of a cohort of smokers in Ontario. A random digit dialled telephone survey of adult smokers residing in Ontario was conducted in 2005, ending 1 month prior to the reduced ignition propensity (RIP) regulation's implementation date. A follow-up survey was conducted one year later. Of the baseline participants, 73.0% (n=435) completed the follow-up survey. The frequency of fire risk behaviours was similar across both surveys. At baseline, only 3.7% of smokers interviewed reported that their cigarettes went out on their own 'often' while smoking. Following the implementation of the reduced ignition propensity legislation, this increased significantly to 14.7%. Results suggest that the proportion of Ontario smokers who reported engaging in behaviour such as leaving a cigarette burning unattended and smoking in bed actually declined, although these declines were not statistically significant across all measures of fire risk.

Citation

Siahpush, M., Yong, H.H., Borland, R., Reid, J., Hammond, D. (2009). Smokers with financial stress are more likely to want to quit but less likely to try or succeed: Findings from the International Tobacco Control (ITC) Four Country Survey. Addiction, 104(8), 1382-1390.

Abstract

Objective: To examine the association of financial stress with interest in quitting smoking, making a quit attempt and quit success.

Design and participants: The analysis used data from 4984 smokers who participated in waves 4 and 5 (2005–07) of the International Tobacco Control (ITC) Four Country Survey, a prospective study of a cohort of smokers in the United States, Canada, the United Kingdom and Australia.

Measurement: The outcomes were interest in quitting at wave 4, making a quit attempt and quit success at wave 5. The main predictor was financial stress at wave 4: ‘. . . because of a shortage of money, were you unable to pay any important bills on time, such as electricity, telephone or rent bills?’. Additional socio-demographic and smoking-related covariates were also examined.

Findings: Smokers with financial stress were more likely than others to have an interest in quitting at baseline [odds ratio (OR): 1.63; 95% confidence interval (CI): 1.22–2.19], but were less likely to have made a quit attempt at follow-up (OR: 0.74; 95% CI: 0.57–0.96). Among those who made a quit attempt, financial stress was associated with a lower probability of abstinence at follow-up (OR: 0.53; 95% CI: 0.33–0.87).

Conclusions: Cessation treatment efforts should consider assessing routinely the financial stress of their clients and providing additional counseling and resources for smokers who experience financial stress. Social policies that provide a safety net for people who might otherwise face severe financial problems, such as not being able to pay for rent or food, may have a favorable impact on cessation rates.

Citation

Hyland, A., Higbee, C., Borland, R., Travers, M.J., Hastings, G., Fong, G.T., Cummings, K.M. (2009). Attitudes and beliefs about secondhand smoke and smoke-free policies in four countries: Findings from the International Tobacco Control Four Country Survey. Nicotine & Tobacco Research, 11(6), 642-649.

Abstract

Introduction: This paper describes the varying levels of smoking policies in nationally representative samples of smokers in four countries and examines how these policies are associated with changes in attitudes and beliefs about secondhand smoke over time.

Methods: We report data on 5,788 respondents to Wave 1 of the International Tobacco Control Four Country Survey who were employed at the time of the survey. A cohort of these respondents was followed up with two additional survey waves approximately 12 months apart. Respondents ’ attitudes and beliefs about secondhand smoke as well as self-reported policies in their workplace and in bars and restaurants in their community were assessed at all waves.

Results: The level of comprehensive smoke-free policies in workplaces, restaurants, and bars increased over the study period for all countries combined and was highest in Canada (30%) and lowest in the United Kingdom (0%) in 2004. In both crosssectional and longitudinal analyses, stronger secondhand smoke policies were associated with more favorable attitudes and support for comprehensive regulations. The associations were the strongest for smokers who reported comprehensive policies in restaurants, bars, and their workplace for all three survey waves.

Discussion: Comprehensive smoke-free policies are increasing over time, and stronger policies and the public education opportunities surrounding their passage are associated with more favorable attitudes toward secondhand smoke regulations. The implication for policy makers is that, although the initial debate over smoke-free policies may be tumultuous, once people understand the rationale for implementing smoke-free policies and experience their benefits, public support increases even among smokers, and compliance with smoke-free regulations increases over time.

Citation

Herd, N., Borland, R. (2009). The natural history of quitting smoking: Findings from the International Tobacco Control (ITC) Four Country Survey. Addiction, 104 (12), 2075-2087.

Abstract

Aims: To describe the long-term natural history of a range of potential determinants of relapse from quitting smoking.

Design setting and participants: A survey of 2502 ex-smokers of varying lengths of time quit recruited as part of the International Tobacco Control (ITC) Four Country Survey (Australia, Canada, United Kingdom, United States) across five annual waves of surveying.

Measurements: Quitters were interviewed by telephone at varying durations of abstinence, ranging from 1 to 1472 days (about 4 years) post-quitting. Smoking-related beliefs and experiences (i.e. urges to smoke; outcome expectancies of smoking and quitting; and abstinence self-efficacy) were included in the survey.

Findings: Most theorized determinants of relapse changed over time in a manner theoretically associated with reduced risk of relapse, except most notably the belief that smoking controls weight, which strengthened. Change in these determinants changed at different rates: from a rapidly asymptoting log function to a less rapidly asymptoting square-root function.

Conclusions: Variation in patterns of change across time suggests that the relative importance of each factor to maintaining abstinence may similarly vary.

Citation

Borland, R., Yong, H.H., Balmford, J., Fong, G.T., Zanna, M.P., Hastings, G. (2009). Do risk-minimizing beliefs about smoking inhibit quitting? Findings from the International Tobacco Control (ITC) Four Country Survey. Preventive Medicine, 19(2-3), 219-223.

Abstract

Objective: To replicate findings that risk-minimizing and self-exempting beliefs lower quit intentions, and to extend this by testing their capacity to prospectively predict smoking cessation.

Method: 13,324 adult (≥ 18 years) cigarette smokers from the USA, Canada, UK, and Australia from one of the first three waves (2002-2004) of the International Tobacco Control 4-Country survey were employed for the predictive analysis where beliefs measured in one wave (1-3) of a cohort were used to predict cessation outcomes in the next wave (2-4).

Results: Both types of belief were negatively associated with both intention to quit in the same wave and making a quit attempt at the next wave. When taken together and controlling for demographic factors, the risk-minimizing beliefs continued to be predictive, but the self-exempting belief was not. Some of the effects of risk-minimizing beliefs on quit attempts seem to be independent of intentions, but not consistently independent of other known predictors. There were no consistent predictive effects on sustained cessation among those who made attempts to quit for either measure.

Conclusions: Countering risk-minimizing beliefs may facilitate increased quitting, but this may not be so important for self-exempting beliefs.

Citation

Borland, R., Yong, H.H., Wilson, N., Fong, G.T., Hammond, D., Cummings, K.M., Hosking, W., McNeill, A. (2009). How reactions to cigarette packet health warnings influence quitting: Findings from the ITC Four Country Survey. Addiction, 104(4), 669-675.

Abstract

Objectives: To examine prospectively the impact of health warnings on quitting activity.

Design: Five waves (2002–06) of a cohort survey where reactions to health warnings at one survey wave are used to predict cessation activity at the next wave, controlling for country (proxy for warning differences) and other factors. These analyses were replicated on four wave-to-wave transitions.

Setting and participants: Smokers from Australia, Canada, the United Kingdom and the United States. Samples were waves 1–2: n = 6525; waves 2–3: n = 5257; waves 3–4: n = 4439; and waves 4–5: n = 3993.

Measures: Warning salience, cognitive responses (thoughts of harm and of quitting), forgoing of cigarettes and avoidance of warnings were examined as predictors of quit attempts, and of quitting success among those who tried (1 month sustained abstinence), replicated across four wave-to-wave transitions.

Results: All four responses to warnings were independently predictive of quitting activity in bivariate analyses. In multivariate analyses, both forgoing cigarettes and cognitive responses to the warnings predicted prospectively making quit attempts in all replications. However, avoiding warnings did not add predictive value consistently, and there was no consistent pattern for warning salience. There were no interactions by country. Some, but not all, the effects were mediated by quitting intentions. There were no consistent effects on quit success.

Conclusions: This study adds to the evidence that forgoing cigarettes as a result of noticing warnings and quit-related cognitive reactions to warnings are consistent prospective predictors of making quit attempts. This work strengthens the evidence base for governments to go beyond the Framework Convention on Tobacco Control to mandate health warnings on tobacco products that stimulate the highest possible levels of these reactions.

Citation

Borland, R., Wilson, N., Fong, G.T., Hammond, D., Cummings, K.M., Yong, H.H., Hosking, W., Hastings, G., Thrasher, J.F., McNeill, A. (2009). Impact of graphic and text warnings on cigarette packs: Findings from four countries over five years. Tobacco Control, 18(5), 358-364.

Abstract

Objectives: To examine the impact of health warnings on smokers by comparing the short-term impact of new graphic (2006) Australian warnings with: (i) earlier (2003) United Kingdom larger text-based warnings; (ii) and Canadian graphic warnings (late 2000); and also to extend our understanding of warning wear-out.

Methods: The International Tobacco Control Policy Evaluation Survey (ITC Project) follows prospective cohorts (with replenishment) of adult smokers annually (five waves: 2002–2006), in Canada, United States, UK and Australia (around 2000 per country per wave; total n=17 773). Measures were of pack warning salience (reading and noticing); cognitive responses (thoughts of harm and quitting); and two behavioural responses: forgoing cigarettes and avoiding the warnings.

Results: All four indicators of impact increased markedly among Australian smokers following the introduction of graphic warnings. Controlling for date of introduction, they stimulated more cognitive responses than the UK (textonly) changes, and were avoided more, did not significantly increase forgoing cigarettes, but were read and noticed less. The findings also extend previous work showing partial wear-out of both graphic and text-only warnings, but the Canadian warnings have more sustained effects than UK ones.

Conclusions: Australia’s new health warnings increased reactions that are prospectively predictive of cessation activity. Warning size increases warning effectiveness and graphic warnings may be superior to text-based warnings. While there is partial wear-out in the initial impact associated with all warnings, stronger warnings tend to sustain their effects for longer. These findings support arguments for governments to exceed minimum FCTC requirements on warnings.

Citation

Fong, G.T., Hammond, D., Hitchman, S.C. (2009). The impact of pictures on the effectiveness of tobacco warnings. Bulletin of the World Health Organization, 87(8), 640-643.

Abstract

Cigarette packages in most countries carry a health warning; however, the position, size and general strength of these warnings vary considerably across jurisdictions.1 Article 11 of the WHO Framework Convention on Tobacco Control (FCTC) and the Article 11 Guidelines adopted at the Third Conference of the Parties in November 2008 have put the spotlight on the inclusion of pictures on tobacco package health warnings. Beginning with Canada in 2001, 28 countries have introduced pictorial warnings and many other countries are in the process of drafting regulations for pictorial warnings (Box 1 and Box 2). This paper presents a brief review of the research studies that support pictorial warnings, reviewed in greater depth by Hammond and by the International Tobacco Control (ITC) Policy Evaluation Project.

Citation

Herd, N., Borland, R., Hyland, A. (2009). Predictors of smoking relapse by duration of abstinence: Findings from the International Tobacco Control (ITC) Four Country Survey. Addiction, 104(12), 2088-2099.

Abstract

Aim: To explore predictors of smoking relapse and how predictors vary according to duration of abstinence.

Design, setting and participants: A longitudinal survey of 1296 ex-smokers recruited as part of the International Tobacco Control (ITC) Four Country Survey (Australia, Canada, United Kingdom and United States).

Measurements: Quitters were interviewed by telephone at varying durations of abstinence (from 1 day to approximately 3 years) and then followed-up approximately 1 year later. Theorized predictors of relapse (i.e. urges to smoke; outcome expectancies of smoking and quitting; and abstinence self-efficacy) and nicotine dependence were measured in the survey.

Findings: Relapse was associated with lower abstinence self-efficacy and a higher frequency of urges to smoke, but only after the first month or so of quitting. Both these measures mediated relationships between perceived benefits of smoking and relapse. Perceived costs of smoking and benefits of quitting were unrelated to relapse.

Conclusions: Challenging perceived benefits of smoking may be an effective way to increase abstinence self-efficacy and reduce frequency of urges to smoke (particularly after the initial weeks of quitting), in order to reduce subsequent relapse risk.

Citation

Hosking, W., Borland, R., Yong, H.H., Fong, G.T., Zanna, M.P., Laux, F., Thrasher, J.F., Lee, W.B., Sirirassamee, B., Omar, M. (2009). The effects of smoking norms and attitudes on quitting intentions in Malaysia, Thailand and four western nations: A cross-cultural comparison. Psychology & Health, 24(1), 95-107.

Abstract

This research investigated the influence of smoking attitudes and norms on quitting intentions in two predominantly collectivistic countries (Malaysia and Thailand) and four predominantly individualistic Western countries (Canada, USA,UK and Australia). Data from the International Tobacco Control Project (N¼13,062) revealed that higher odds of intending to quit were associated with negative personal attitudes in Thailand and the Western countries, but not in Malaysia; with norms against smoking from significant others in Malaysia and the Western countries, but not in Thailand; and with societal norms against smoking in all countries. Our findings indicate that normative factors are important determinants of intentions, but they play a different role in different cultural and/or tobacco control contexts. Interventions may be more effective if they are designed with these different patterns of social influence in mind.