Maryam Khan, and Naeem Aslam. “Prevalence of Caffeine Intake Among Cigarette Smokers: Directing Caffeine Use Disorder Among Pakistani Population”. Pakistan Journal of Medical Research 59, no. 1 (July 6, 2020): 15–21. Accessed August 10, 2026. https://pjmr.org.pk/index.php/pjmr/article/view/60.