OBJECTIVE: To determine the role frequency of decreased Forced expiratory volume in 1 second (FEV1) in between asymptomatic smoker and non smoker doctors. SETTING: Allied Hospital and District Head Quarter Hospital Faisalabad. STUDY DESIGN: Descriptive case series. SAMPLE SIZE: 350. STUDY DURATION: Six month: June 1, 2014 to November 30, 2014. SAMPLING TECHNIQUE: Non-probability consecutive sampling. STUDY DESIGN: Descriptive case series. METHODS: A total of 350 doctors meeting the inclusion

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... teria were selected for this study. Outcome variable was decreased FEV1 in both smoker and non smoker doctors. RESULTS: The mean age of the patients was 34.9 ± 5.9 years. The mean percentage of FEV1 predicted of the patients was 89.6 ± 8.3 percent. There were 35 (10.0%) patients had decreased FEV1 and 315 (90.0%) patients had not decreased FEV1. There were 33 (94.3%) patients smoker in which FEV1 decreased and 2 (5.7%) patients non-smoker in which FEV1 decreased. CONCLUSION: It is concluded from the results of this study that frequency of decreased FEV1 was found in doctors, but it is found more in asymptomatic smokers than in non smokers. As in our study decreased FEV1 was found in 94.3% smokers and 5.7% in non smokers.