Since their introduction in Europe in 2006 and the U.S. in 2007, the use of e cigarettes a.k.a., vapes has skyrocketed. A recent review from researchers in Australia found the results Flavoring Agents in E cigarette Liquids: A Comprehensive Analysis of Multiple Health Risks Cureus E Cigarettes (Vapes) Smoking and Tobacco Use CDC PDF) Patterns of E Cigarette Use Among Youth and Young Adults: Review of the Impact of E Cigarettes on Cigarette Smoking What does recent biomarker literature say about the likely harm from e cigarettes? PHCC