Tobacco smoking is widely prevalent all over the world and it continues to rise in developing countries. Smoking has a deleterious effect on pulmonary functions. Smoking is the single most significant risk factor contributing to the development of Chronic obstructive airway diseases (COPD). Spirometry by a trained health professional gives an indication of lung health by measuring airway abnormality. Objectives were to study pulmonary function test (PFT) in smokers and non-smokers Tobacco smoking, in the form of cigarettes, has a deleterious effect on the health, mainly on the pulmonary functions. Smoking is highly associated with an abnormal PFT. Cessation of smoking should be encouraged and PFTs from time to time in asymptomatic adults both smokers and nonsmokers will be useful for early identification of abnormalities.