Poor Perceived Health is Associated with Current use of Electronic Cigarette among Current and Former Smokers: Findings from the CONSTANCES Cohort.

BACKGROUND: Electronic cigarettes (e-cigarettes) have become increasingly popular, yet beyond social or technical features, the specific health-related reasons adults use e-cigarettes remain poorly understood. OBJECTIVE: To explore the cross-sectional associations between perceived health and current e-cigarette use in a large population-based cohort. METHODS: From the participants included in the French CONSTANCES cohort (a large general-purpose national population-based cohort) from 2015 to 2017, we included 18,300 ever tobacco smokers with data on their e-cigarette use. We used logistic regressions to estimate the associations between e-cigarette use and perceived health (global and respiratory), stratifying on participants' smoking status and adjusting for sociodemographic characteristics. To examine the role of objective health features (reported diagnoses and measured parameters during a health examination), we adjusted for prior history of respiratory and cardiovascular diseases, diabetes, cancer, spirometry, and blood pressure. Finally, we examined the effect of additionally adjusting for several health-related behaviors. RESULTS: Participants with poor perceived health (global and respiratory) were at greater risk of e-cigarette use. These associations remained unchanged after adjustment for objective health features and health-related behaviors (e.g., in current smokers, for global perceived health, an odds ratio of 1.10 [95% CI 1.03-1.16] per increase on an 8-point scale from very good to very poor). CONCLUSIONS: Our findings suggest that the more current and former smokers felt unhealthy, the more they tended to currently use e-cigarettes. People who regularly use e-cigarettes should obtain medical supervision that takes into account not only objective diagnoses and measurements but also perceived health. Counseling practices could include assessing perceived health status to reinforce motivation to quit smoking.