Known Health Effects of E Cigarette Use Kansas Health Institute Vaping is NOT Harmless. Know the long term effects before it's too late! Most e cigarette liquids contain high levels of nicotine, which is highly addictive. Despite the legal age being 21, vaping devices E Cigarettes and Vaping Tear Pad Health Edco Toxicity, Chemistry, and Public Health Relevance of Emerging Nicotine Analog Vapes, Pods, and Pouches Chemical Research in Toxicology 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