Smoking prevalence remains high in France (28,8% of French adults were daily smokers in 2015). In November 2016, Santé publique France, the French National Public Health Agency, launches a national campaign aiming at triggering quit attempts among smokers: "Moi(s) sans tabac'. This campaign is inspired by the English "Stoptober', which generated 350,000 additional quit attempts in 2012. Moi(s) sans tabac sets smokers the objective of being smoke-free for one month. After this period, smokers are five times more likely to become permanent ex-smokers. The campaign is based on the social contagion theory and the PRIME theory of motivation. The evaluation of the project consists in a process evaluation and an effectiveness evaluation. The main outcome for effectiveness is quit attempt in the last quarter of 2016.