Purpose: Lung age is a method that can be used to show cigarette-related early changes in the lungs, which are calculated according to sex, forced expiratory volume in one second (FEV1), height, and motivate patients to quit smoking. The aim of this study is to investigate the effects of cigarette on lung age and pulmonary function tests. Materials and methods: This study was conducted in 85 smokers and 85 non-smokers. Participants' age, gender, education, marital status, occupation, carbon monoxide (CO) values, Fagerström addiction scores and respiratory function test results were recorded. Lung age was calculated using height and FEV1 values measured by respiratory function test according to sex. Results: Of the smokers, the mean chronological age of smokers was 35.81 ± 12.27, the mean lung age was 57.15 ± 23.54 years. Of the nonsmokers, the mean age of the chronologic age was 34.93 ± 10.85 years and the mean age of the lungs was 44.17 ± 16.23 years. When the correlation between lung age of smokers and smoking package/year was examined, there was a moderate significantly correlation in the positive direction . Of the smokers, the mean of CO levels was 12.22±5.87 ppm, the Fagerström smoking dependence average was 6.61±2.28 points, and the mean of the smoker's package/year was 21.82±14.69. FEV1 and forced vital capacity (FVC) values of the smokers were significantly lower than non-smokers. Conclusion: In our study, smokers had higher lung age than non-smokers. Behavioral cognitive methods, motivational support and pharmacological treatment suggested by the guidelines are applied together in the smoking cessation policlinics. In addition to these, explaining the results of lung function tests on individuals, differences between the chronological age and the lung age of the person will motivate them to quit smoking.