These are the data in SPSS format (with value labels and variable labels) and the SPSS syntax file from a randomized trial testing the efficacy of the Stop-tabac application for smartphones (main outcome: smoking cessation), the comparison group received a control application. The baseline and follow-up questionnaires are available here: https://archive.org/details/@stopdependance_ch The results and protocol are published here: Etter JF, Khazaal Y. The Stop-tabac smartphone application for smoking cessation: a randomized controlled trial. Addiction. 2022 May;117(5):1406-1415. doi: 10.1111/add.15738. and Etter JF, Khazaal Y. The Stop-Tabac smartphone application for smoking cessation: study protocol for a randomized controlled trial in th...