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Purpose : This study explores the interaction between smoking and exercise by comparing the effects of different aerobic exercise intensities on lung function in smokers. It aims to identify lung function differences and offer personalized exercise recommendations for health promotion. Methods : For this experiment, 34 adult men and women were randomly assigned to high-intensity and low-intensity aerobic groups. Both groups completed three cycles of aerobic exercise per week for four weeks. Respiratory function was assessed by measuring forced vital capacity (FVC), forced expiratory volume in 1 second (FEV1), forced expiratory volume/forced vital capacity (FEV-1/FVC%), and peak expiratory flow (PEF) twice before and after the experiment. Aerobic exercise was performed on stationary bicycles with eight difficulty levels. Result : This study showed that the FVC, FEV1, and PEF values in the high-intensity aerobic group and the FVC values in the low-intensity aerobic group increased significantly after 4 weeks of cycling exercise. There were also statistically significant differences when comparing the mean increases in FVC and FEV1 values between the groups. Conclusion : The study found that in smokers, cycling exercise led to a greater increase in respiratory function in the high-intensity aerobic group compared to the low-intensity group. This suggests that smoking hinders respiratory improvement and that high-intensity aerobic exercise is more effective. Therefore, for patients with smoking-related respiratory diseases, incorporating high-intensity aerobic exercise and smoking cessation is crucial in respiratory therapy and programs aimed at enhancing lung function.