Think vaping is harmless? Think again. E cigarettes may seem safer, but they still expose usersespecially teensto nicotine, harmful chemicals, and long term health risks. Nicotine can affect brain development, increase addiction risk, US Official Expects 'Hundreds More' Cases of Vaping Illness Chicago News WTTW E Cigarettes Are Effective at Helping Smokers Quit, a Study Says The New York Times PDF) E Cigarettes are More Addictive than Traditional CigarettesA Study in Highly Educated Young People E cigarette newsAuthorities say e cigarette risks justify ban on vaping 'lifestyle' Vaping has soared in popularity over the last decade, growing from about 7 million users in 2011 to 41 million in 2018.