RESUMO
To compare the lung function tests in healthy non-smoker with age and sex matched smokers who are asymptomatic of respiratory impairment. This cross sectional analytic study was carried out from June 2009 to November 2009 in Department of Medicine and Pulmonology, Jinnah Hospital, Lahore. A total of 200 subjects were included in the study. All individuals were selected from healthy general public visiting Jinnah hospital Lahore as attendants of the patients.FVC, FEV1 and FEV1/FVC were measured and recorded in Performa. Data was entered and analyzed in SPSS 10. Mean age was 36.77+6.58 years. It was 34.11+7.38 in smokers and 33.43+5.39 in non-smokers group. Mean FEV1 was 2.55+0.79 in smokers and 3.52+0.55 in non-smokers. Mean FVC was 3.94+0.69 in smokers and 4.35+0.69 in non-smokes. Smoking causes significant reduction in lung functions in asymptomatic smokers which can be prevented by quitting smoking