Knowledge, Attitude, and Practice of E-Cigarettes of Adolescents and Adults in Saudi Arabia: A Cross-Sectional Study oleh Rasha Doumi, Sahar Khaytan, Alanoud Suliman Alobaidan, Bashayer Mohammad Alqahtany, Norah Mohammed Aldosari, Aljohara Ayed Almutairi, Alaa Askar Alanazi, Amel Fayed