INTRODUCTION In October 2016, the first edition of Mois sans tabac (Tobacco-Free Month) was launched, a campaign which had invited French smokers to challenge themselves to quit smoking for the whole month of November. We aimed to study the effectiveness of this social marketing intervention on quit attempts (QA) in the general French population, and to study possible differences according to sociodemographic characteristics. METHODS This study used data from the 2017 Health Barometer survey, a random survey conducted by telephone on 25319 individuals. It included 6341 respondents who reported that they were daily smokers when the Mois sans tabac campaign was launched in 2016. The association between self-declared exposure to the campaign and making a QA has been studied using multivariate logistic regressions. RESULTS Exposure to the 2016 Mois sans tabac campaign is associated with a QA lasting at least 24 hours in the final quarter of 2016 (AOR=1.32; 95% CI: 1.07–1.63, p<0.01), with a QA lasting at least 30 days (AOR=1.95; 95% CI: 1.31–2.91, p<0.001), and being abstinent at the time of the interview in 2017 (AOR=2.39; 95% CI: 1.37–4.15, p<0.01). A dose-effect relationship is observed between the frequency of exposure to the campaign and QA, which is mostly explained by the number of sources of exposure (television, radio, posters, the press, the internet and social networks). Although certain priority groups (e.g. manual workers, the unemployed) had poorer recall of the campaign than other groups, the impact of self-reported exposure to the campaign on QA in unemployed people or those with less than high school educational level appears to have been greater. CONCLUSIONS These analyses suggest the effectiveness of the 2016 Mois sans tabac intervention, in a context of strengthening public tobacco control policies in France, which may have contributed to the drop in smoking observed between 2016 and 2019. Published by European Publishing. © 2021 Guignard R. et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License. (https://creativecommons.org/licenses/by/4.0/)