Maryam Khan and Naeem Aslam (2020) “Prevalence of Caffeine Intake among Cigarette Smokers: Directing Caffeine Use Disorder among Pakistani Population”, Pakistan Journal of Medical Research, 59(1), pp. 15–21. Available at: https://pjmr.org.pk/index.php/pjmr/article/view/60 (Accessed: 24 September 2026).