The Demographics of E Cigarette Users [Part 1 of 3 Part Series] E cigarettes Models and Mechanisms of Public Health Four in 10 retailers sell e cigarettes and vaping liquids to under 18s Vaping The Guardian E cigarette prevalence by smoking status Tobacco Use in Canada University of Waterloo Up in a puff of smoke? EU plan threatens e cigarettes The Independent The Independent Anti Tobacco Groups Want Ohio to Add Taxes on E Cigarettes and Chewing Tobacco Ideastream Public Media