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Objective: To determine frequency of abnormal pulmonary function tests in asymptomatic smokers undergoing coronary artery bypass grafting. Study Design: Descriptive cross-sectional study. Place and Duration of Study: Department of Anesthesiology, Army Cardiac Center, Lahore, from Aug 2020 to Jan 2021. Methodology: Total 200 patients undergoing CABG surgery were included in the study with non-probability consecutive sampling technique. Patients 30-60 years of age who are smokers for at-least 10 years with smoking pack years of >5 and are active smokers or have quitted smoking for not more than 1month were included in study. These patients underwent pulmonary function tests by the staff certified in performing and interpreting these tests and their report results were included in data. Results: All patients were male. Mean age and body mass index were 51.78 ± 6.51 years and 26.12 ± 3.09 kg/m2 respectively. Mean smoking pack/years were 13.34 ± 4.18. Active smokers were 84% and those who had quitted but not >1 month were 16%. One hundred and twenty-seven patients (63.5%) had normal PFT's, 59 (29.5%) had mild obstruction, 14 (7%) had moderate obstruction with significant p-value. Conclusion: frequency of abnormal pulmonary function tests is statistically significant in asymptomatic smokers presenting for coronary artery bypass grafting. [ABSTRACT FROM AUTHOR]