Background: Cigarette smoking has a significant impact on pulmonary function. Pulmonary function testing is a common procedure for diagnosing and monitoring respiratory disorders. In this study, the pulmonary function tests of smokers and nonsmokers were compared. Materials and Methods: Between January and June 2022, a case-control study was undertaken among smokers and nonsmokers. A total of 100 participants were recruited, 50 of whom were nonsmokers (controls) and 50 of whom were smokers (cases). PFT measurements were performed three times on each patient, with the greatest level recorded. Unpaired t test was used to analyse the data. Result: Pulmonary function parameters were significantly reduced in smokers and obstructive pulmonary impairment was commonest. The mean FVC, FEV1, FEV1/FVC, PEFR, FEF25%-75% in nonsmokers and smokers were 3.15±1.02, 2.62±0.92: 2.81±0.97, 2.17±0.75: 85.12±26.32, 82.13±21.85: 7.12±2.12, 5.86±1.98: 3.86±0.83, 3.12±1.21 respectively. Conclusion: Smokers had significantly lower lung function tests than nonsmokers, with obstructive pulmonary impairment being the most frequent. Thus, spirometry can detect a variety of lung problems at an early stage, reducing eventual morbidity.

Background: Cigarette smoking has a significant impact on pulmonary function. Pulmonary function testing is a common procedure for diagnosing and monitoring respiratory disorders. In this study, the pulmonary function tests of smokers and nonsmokers were compared. Materials and Methods: Between January and June 2022, a case-control study was undertaken among smokers and nonsmokers. A total of 100 participants were recruited, 50 of whom were nonsmokers (controls) and 50 of whom were smokers (cases). PFT measurements were performed three times on each patient, with the greatest level recorded. Unpaired t test was used to analyse the data. Result: Pulmonary function parameters were significantly reduced in smokers and obstructive pulmonary impairment was commonest. The mean FVC, FEV1, FEV1/FVC, PEFR, FEF25%-75% in nonsmokers and smokers were 3.15±1.02, 2.62±0.92: 2.81±0.97, 2.17±0.75: 85.12±26.32, 82.13±21.85: 7.12±2.12, 5.86±1.98: 3.86±0.83, 3.12±1.21 respectively. Conclusion: Smokers had significantly lower lung function tests than nonsmokers, with obstructive pulmonary impairment being the most frequent. Thus, spirometry can detect a variety of lung problems at an early stage, reducing eventual morbidity.