Age, gender and socioeconomic patterns of awareness and usage of e cigarettes across selected WHO region countries: evidence from the Global Adult Tobacco Survey BMJ Open Health Effects of Vaping Smoking and Tobacco Use CDC Notes from the Field: Use of Electronic Cigarettes and Any Tobacco Product Among Middle and High School Students United States, 20112018 MMWR Vaping Safety, Smoking, Dangers, Pros, Cons, Debate, E cigarettes, & Tobacco Britannica Why Youth Vape Smoking and Tobacco Use CDC Elevated Toxic Element Emissions from Popular Disposable E Cigarettes: Sources, Life Cycle, and Health Risks ACS Central Science