Household composition, smoking cessation and relapse: results from a prospective longitudinal Australian cohort

AimsTo examine the association between household members and their tobacco smoking behaviour on patterns of smoking cessation and relapse. Design and participantsData was sourced from 19 waves (years 2001 to 2019) of the nationally representative Household Income and Labour Dynamics in Australia (HILDA) survey, with all household members 15 years or older completing the survey annually. The final sample included, on average, 3,056 ex-smokers and 2,612 smokers per wave. MeasurementsSelf-reported annual smoking status was used to construct measures of smoking cessation and relapse. Information on household structure and relationships was then used to develop variables describing the presence of household members and their smoking status by relationship to the individual (i.e., child, parent, spouse, sibling, or other). Multivariate regression analyses were then used to predict the likelihood of smoking cessation and relapse controlling for the presence of other household members and their smoking status, sociodemographic characteristics, number of cigarettes smoked per day, previous quit attempts, and years abstained from smoking. FindingsIndividuals that lived with non-smokers were more likely to quit [OR1.22 (95%CI 1.11;1.34)] relative to those living alone. However, this favourable association was negated if living with another smoker, which was associated with a reduced likelihood of smoking cessation [OR0.77 (95%CI 0.72;0.83)] and a higher likelihood of relapse [1.37 (95%CI 1.22;1.53)]. In particular, living with a spouse or parent that smoked reduced the likelihood of smoking cessation [OR0.71 (95%CI 0.65;0.78) and OR0.71 (95%CI 0.59;0.84), respectively] and increased the likelihood of relapse [OR1.47 (95%CI 1.28;1.69) and OR1.39 (95%CI 1.00;1.94) respectively] relative to living with their non-smoking counterparts. ConclusionsHousehold composition and intrahousehold smoking behaviour should be considered when delivering, or estimating the benefits of, smoking cessation interventions. Interventions which encourage smoking cessation at the household level may assist individuals to quit and abstain from smoking.