Husain, A., Abdullah, I., Nagra, M.H., Maqsood, A., Sarfaraz, M. and Qureshi, F.S. 2012. Comparison of Forced Expiratory Volume in One Second (FEV1) between Smoker and Non Smoker Doctors. Annals of Punjab Medical College. 6, 2 (Dec. 2012), 131-135. DOI:https://doi.org/10.29054/apmc/2012.442.