E cigarettes: further flavours of controversy within the controversy The Lancet Respiratory Medicine How to Smoke E Cigarettes Your First Vaping Guide SMOKO E Cigarettes Emissions from Electronic Cigarettes: Key Parameters Affecting the Release of Harmful Chemicals Environmental Science & Technology Research & Commentary: Cities and States Consider Increasing Tobacco Age Limit to 21, Regulating ENDS Like Tobacco Products The Heartland Institute Juul Illegally Marketed E Cigarettes, F.D.A. Says The New York Times