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Abstract Background and purpose: Cigarette smoking is an important worldwide health problem. Cigarette smoking carries major health risks with the most cause-specific mortalities being those of respiratory and cardiovascular diseases. Therefore, smoking habits may affect the respiratory function of youths. The aim of this study was to compare between the effects of continuous moderate aerobic exercise versus high intensity interval training (HIIT) on ventilatory functions in smoker students.Subjects and Methodology: sixty smoker men and thirty nonsmoker men participated in this study. Their age ranged from 18 to 25 years old, their body mass index (BMI) ranged from 20 to 30 kg/m2 and they were moderate smoker. They were assigned into three equal groups: group (A): 30 smoker men received moderate aerobic exercise program for eight weeks as three times per week. group (B): 30 smoker men received high intensity interval training (HIIT) for eight weeks as three times per week. group (c): 30 men nonsmoker (controlled group) not received any type of exercise; they performed their normal daily living activities |