Limitations and strengths
depressed
SECONDARY
As this study was not originally intended for the present secondary data analysis, the dataset included only a limited number of predictor variables, which limited our ability to predict smoking cessation, reduction and relapse. The response rate at 6-month follow-up was low (27%), and respondents to the 6-month survey differed from non-respondents (respondents were older, less depressed, they used the app more frequently), and this may limit he generalizability of our results. The low response rate at follow-up can possibly be explained by the fact that the participants had never met the researchers personally and therefore may not have felt connected to them.Strengths of the study include a large sample of people of all ages who lived in all departments of France and all cantons of French-speaking Switzerland, and the collection of data on app use from 100% of participants. Finally, our results may not be transferable to users of other smoking cessation apps.