This retrospective study aims to evaluate epidemiologic characteristics of patients attending stop smoking courses, based on group therapy, testing their influence on smoking cessation in univariate and multivariate model. A total of 123 patients were included in this study. Mean age was 53 (+/-11). Sixty-seven percent were women. At the end of the courses 66% of patients stopped smoking, after 12 months only 39% remained abstinent. Patients younger than 50 years statistically tended to continue smoking 6 months (P = .02-R.R. = 1.49, C.I. 95%: 1.06-2.44) and 12 months (P = .03-R.R. = 1.37, C.I. 95%: 1.02-2.52) after the end of the courses. A low self-confidence in quitting smoking was significantly related to continuing tobacco consumption after 6 months (P = .016-R.R. = 1.84, C.I. 95%: 1.14-2.99). Low adherence to therapeutic program was statistically associated to maintenance of tobacco use at 6 months (P = .006-R.R. = 1.76, C.I. 95%: 1.32-2.35) and 12 months (P = .050-R.R. = 1.45, C.I. 95%: 1.11-1.88). This association was confirmed at 6 months in the analysis performed on logistic regression model (P = .013).