BUTT, A.; KHAN, J. A. Increasing use of Electronic Cigarettes: An alarming trend. Pakistan Journal of Chest Medicine, [S. l.], v. 26, n. 1, p. 01–02, 2020. Disponível em: https://pjcm.net/index.php/pjcm/article/view/672. Acesso em: 22 apr. 2026.