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Background and Aims: The addictive potential of electronic cigarettes (e‐cigarettes) remains to be fully understood. We identified patterns and correlates of perceived addiction to e‐cigarettes and perceived addictiveness of e‐cigarettes relative to tobacco cigarettes (relative addictiveness) in dual users as well as exclusive e‐cigarette users. Design, Setting and Participants: Observational study using cross‐sectional survey data from England (2016) from the International Tobacco Control Project (ITC) Four Country Smoking and Vaping (4CV) survey. The study comprised 832 current e‐cigarette users who had been vaping for at least 4 months. Measurements: Perceived addiction to e‐cigarettes and relative addictiveness of e‐cigarettes were examined. Socio‐demographic factors were age, gender and education; markers of addiction included urge to vape, time to first vape after waking and nicotine strength used; vaping and smoking characteristics included frequency and duration of e‐cigarette use, intention to quit, adjustable power or temperature, enjoyment, satisfaction relative to tobacco cigarettes and tobacco cigarette smoking status. Findings A total of 17% of participants reported feeling very addicted to e‐cigarettes, while 40% considered e‐cigarettes equally/more addictive than tobacco cigarettes. Those who felt very addicted had higher odds of regarding e‐cigarettes as more addictive than tobacco cigarettes (odds ratio 3.4, 95% confidence interval 2.3–5.1). All markers of addiction, daily use and enjoyment were associated with higher perceived addiction, whereas time to first vape after waking, daily vaping and perceiving vaping as less satisfying than smoking were associated with relative addictiveness. Conclusions: Markers of addiction to e‐cigarettes appear to correspond with perceived addiction to e‐cigarettes, suggesting that self‐reported perceived addiction might serve as an indicator of addiction. Prevalence both of markers of addiction and perceived addiction were comparatively low overall, suggesting a limited but relevant addictive potential of e‐cigarettes. Additionally, positive and negative reinforcement, reflected here by enjoyment and relative satisfaction, might play a role in e‐cigarette addiction. [ABSTRACT FROM AUTHOR]

Smoke-free policies are effective in preventing secondhand smoke (SHS) exposure, but their adoption at home remains largely voluntary. This study aimed to quantify SHS exposure in homes with residents who smoke in Europe according to households' characteristics, tobacco consumption habits, and national contextual factors. Cross-sectional study (March 2017–September 2018) based on measurements of air nicotine inside 162 homes with residents who smoke from nine European countries. We installed passive samplers for seven consecutive days to monitor nicotine concentrations. Through self-administered questionnaires, we collected sociodemographic information and the number of individuals who smoke, smoking rules, frequency, location, and quantity of tobacco use in households. Country-level factors included the overall score in the Tobacco Control Scale 2016, the smoking prevalence, and self-reported SHS exposure prevalence. Nicotine concentrations were analyzed as continuous and dichotomous variables, categorized based on the limit of quantification of 0.02 μg/m3. Overall, median nicotine concentration was 0.85 μg/m3 (interquartile range (IQR):0.15–4.42), and there was nicotine presence in 93% of homes. Participants reported that smoking was not permitted in approximately 20% of households, 40% had two or more residents who smoked, and in 79% residents had smoked inside during the week of sampling. We found higher nicotine concentrations in homes: with smell of tobacco smoke inside (1.45 μg/m3 IQR: 0.32–6.34), where smoking was allowed (1.60 μg/m3 IQR: 0.68–7.63), with two or more residents who smoked (2.42 μg/m3 IQR: 0.58–11.0), with more than 40 cigarettes smoked (2.92 μg/m3 IQR: 0.97–10.61), and where two or more residents smoked inside (4.02 μg/m3 IQR: 1.58–11.74). Household nicotine concentrations were significantly higher in countries with higher national smoking prevalence and self-reported SHS exposure prevalence (p < 0.05). SHS concentrations in homes with individuals who smoke were approximately twenty times higher in homes that allowed smoking compared to those reporting smoke-free household rules. Evidence-based interventions promoting smoke-free homes should be implemented in combination with strengthening other MPOWER measures. • We assess air nicotine and reported smoking habits in homes with smokers in 9 EU countries. • 93% of the homes had nicotine presence and 78% allowed smoking inside. • SHS exposure was similar in homes where smoking was totally and partially allowed. • SHS levels were over 60 times higher with 2 or more smokers smoking indoors than in homes where no one smoked inside. • SHS exposure at homes was influenced by tobacco-related national-level factors. [ABSTRACT FROM AUTHOR]