E-cigarettes are battery-powered devices that look like cigarettes and deliver an aerosol of nicotine and other chemicals. These devices are largely unregulated, with no effective controls on marketing them to minors. Despite industry claims that it markets only to adults, the percentage of 12-18 year olds who use e-cigarettes doubled from 2011 to 2012. As of 2012, an estimated 1.8 million American adolescents have used the devices.
Journal of Adolescent Health, November 2013