To determine the prevalence of cigarette smoking, to examine the risk factors affecting smoking amongst adults and to assess the opinion of patients about quitting smoking who were evaluated at our outpatient clinic. Six hundred fifty-nine patients who were evaluated at our outpatient clinic between June 2005 and June 2006 were included in the study. This is a cross-sectional study that evaluates prevalence of smoking. Data gathered by applying face to face questionnaires. The mean age of 659 participants [417 (63.3%) males and 242 (36.7%) females] was 53.1 +/- 16.2 years. The prevalences were; 33% (n= 218) smokers, 39% (n= 258) ex-smokers and 28% (n= 183) non-smokers. Smoking prevalence under age of 50 was significantly higher (p= 0.0001). There was a positive significant relation between education and smoking amongst women, but this relationship was not significant amongst men. The most common reason for beginning smoking was because of friends (72%). 86% wanted to quit smoking. 48.9% tried to quit smoking but couldn't be successful. The prevalence of active smoking and quit smoking among patients who applied to pulmonary medicine outpatient clinic were 33% and 28%, respectively. The ratio of smoking and smoking pack-years was higher among men. Eighty-six percent of patients wanted to quit, 25% tried to quit but could not be successful, and 49% quit smoking but began smoking again. According to these findings, patients who were smoking wanted to quit but couldn't be successful without a professional help. We planned to found a smoking cessation outpatient clinic at our department.