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Electronic cigarettes (e-cigarettes) — cigarette-shaped, battery-powered, nicotine-vapor delivery devices — are growing rapidly in popularity. They have been promoted as smoking-cessation aids, but we know little about their risks and benefits.
Two studies funded by the CDC and published in 2013 documented the increasing popularity of e-cigarettes. In mail and Web-based surveys of adults in 2010 and 2011, awareness of e-cigarettes increased from 39% to 58%, and ever-use of e-cigarettes increased from 2.5% to 6.2%. Among current smokers, ever-use of e-cigarettes increased from 7.8% to 21.2% (Nicotine Tob Res 2013 Sep; 15:1623). In a school-based survey conducted in 2011 and 2012, similar trends were observed among youth, with ever-use of e-ci…