E Cigarettes: Patent Analysis and Technological Evolution by Copperpod IP Medium Are Electronic Cigarettes A Gateway To Smoking? (Infographic) E Cigarette Direct WHO Study finds e cigarettes ineffective in quitting smoking Elets eHealth When Were Vapes Invented? History of E Cigarettes OK Vape Smoking and Vaping National Institute of Environmental Health Sciences If you're trying to quit smoking, vaping should not be the first thing you try. E cigarettes can contain more addictive nicotine than cigarettes and the long term health effects of e cigarettes are unknown.