International audienceThis article presents the results of two French qualitativeand quantitative studies aimed at examining the effectiveness of the European Union's proposed warning labelsfor cigarette packs. Results show that graphic warnings (i.e.those that include a picture) are more effective than text-only ones. Particularly, social and physical threats, fearappeal messages and those with a human presence are perceived by smokers and non smokers as the most effective.On the contrary, some warnings appear less convincing,particularly the messages on cigarette packs that relate toself-efficacy that should be revised.Cet article présente les résultats de deux études françaises,qualitative et quantitative, réalisées sur les nouveaux aver...