Objective: This study aimed to determine the frequency of smoking cessation and affecting factors in patients who applied to the smoking cessation clinic. Method: This study included smokers aged 18 years and over who applied to the Chest Diseases Clinic Smoking Cessation Outpatient Clinic between 1 April 2019 and 31 July 2019. All participants were evaluated with a sociodemographic questionnaire, Fagerström Test for Nicotine Dependence (FNBT) and Beck Depression Scale during the initial outpatient clinic admission. Subsequently, smoking cessation treatment was started and all participants were called at 6 and 12 months and their smoking cessation status was questioned. Smokers who did never smoked for the last 1 year were accepted as ex-smokers. Results: A total of 270 participants were included in the study, and 48 (19.5%) of the participants were found to quit smoking at the end of one year. There was no significant difference between ex-smokers and current smokers in terms of age, gender, marital status, educational level, employment status, income level, duration of smoking, FNDT and Beck’s depression scores (p>0.05). However, smoking status in the phone call at 6-month (OR=316.976 and 95% CI=80.035-1255.374, p