The objective of this study was to verify the prevalence of smokers among medical students. Among the 455 students who answered the questionnaire, the prevalence of smokers was 8.1%, the mean age being 24.9 years and male predominance (64.8%, p=0.0004). The main reasons for smoking initiation were: friends (45.9%), anxiety (32.4%) and stress (18.9%). Predominantly they lived alone (45.9%) and keep social relationwith smokers 83.7% (p<0.0001). Health professionals were considered as "behaviourmodels" for 70% of smokers and non-smokers, however, non-smokers consider it more important to conduct campaigns on the subject (p=0.0183). The mild degree of dependence characterized 89.1% of smokers, according to the Fagerstöm Test. Although 72.9% reported their desire to quit smoking, only 48.6% tried, and unsuccessfully. As a conclusion, smoking prevalence was relatively low compared to national statistics.