Int. J. Environ. Res. Public Health 2010, 7 2796 was 70% longer for men and 100% longer for women. Both health-related behaviours (i.e., excessive alcohol use and healthy diets) had a significant impact on the abstinence duration among men, where a negative effect for alcohol abuse and a positive effect for healthy dietary habits were observed. For women, excessive alcohol use didn’t seem to influence abstinence duration. Table 3. Abstinence duration models—Accelerated failure time (log-logistic distribution). Time ratios _Men _Women Education (ref: compulsory) Secondary 1.28 (1.68) 1.61*** (3.69) Higher 2.16*** (4.19) 2.27*** (4.89) Income (ref: low income) Middle income 1.23 (1.58) 1.12 (0.96) High income 1.47* (2.47) 1.44* (2.47) Age (ref: 18–24) 25–44 0.93 (−0.50) 0.82 (−1.37) 45–65 0.57** (−3.34) 0.48*** (−4.84) Marital status (ref: non-married) Married 0.99 (−0.05) 0.99 (−0.02) Heavy drinking (ref: no) Yes 0.76* (−2.55) 0.83 (−1.49) Interest in healthy diet (ref: no) Yes 1.47** (3.24) 1.35* (2.01) Region with high prevention intensity (ref: no) Yes 1.73*** (5.26) 2.04*** (7.26) N 2,614 3,522 Note: t-statistics in parentheses * p < 0.05, ** p < 0.01, *** p < 0.001; Constants, scale parameters and year dummies not reported. 4. Discussion Although socioeconomic inequalities in smoking were extensively documented, a large part of the studies focused on the association between one particular socioeconomic dimension—mostly the education level—and smoking prevalence (Schaap and Kunst [13]). The aim of our study was to analyse the simultaneous impact of education and income on smoking cessation, using the 2001–2007 editions of the Swiss Tobacco Survey. The cessation behaviour was assessed with two outcomes, resulting in two independent analyses. We first analysed the probability of being a successful quitter by means of multivariate logistic regressions. Then, using retrospective information about smoking behaviour, we analysed the time before relapse in the duration analysis framework. We found evidence of a socioeconomic gradient in successful cessation and abstinence duration with respect to education level and income for both men and women. The gradient associated with education is more pronounced for women than for men, while income seems to have a comparable impact in both groups.