Qayyum, Fatima, Sidra Qayyum Malik, Amber Tasnim Qureshi, and Afreen Diju. 2020. “Peak Expiratory Flow Rates in Smoker Asthmatics Versus Non-Smoker Asthmatics: A Comparative Analysis”. Pakistan Journal of Physiology 16 (4):10-12. https://pjp.pps.org.pk/index.php/PJP/article/view/1255.