Comparison of rates of smoking across countries revealed that students are more likely to begin smoking in medical school than to give it up and increase their cigarette consumption rather than decrease it. A cross-sectional survey of all consenting medical students in a private medical university in north Malaysia was conducted in 2008 to determine the prevalence and smoking habits among them. A self administered questionnaire which was returned to the investigators in a sealed envelope was used. Results were tabulated and analysed with SPSS version 13.0 software. The response rate was 83.3% (508/610). The prevalence rate for current smokers was 5.3% (27/508) and for ever smokers 9.3% (47/508). Factors significantly associated with smoking were gender (p<0.001), age group (p<0.001) and family income (p=0.003). The odds of being a smoker was 14 folds high when a family member smoked and the odds of being an ever smoker was almost 6 folds more when a family member smoked. Friends were the most common influence to start smoking and the most common reason to stop smoking among ever smokers. The reasons for not smoking among the never smokers were health concerns and the distasteful smell of cigarettes. A module on how to help medical students to stop smoking should be included in the curriculum of every medical school. This will not only help them become good educators but will prevent them from picking up the habit. Educational intervention should also include family members who smoke.