Some e cigarettes deliver a puff of carcinogens Researchers find e cigarettes help reduce smoking, presence of carcinogen The Commonwealth Times E cigarettes have 10 times more carcinogens, Japanese researchers say South China Morning Post Older users of e cigarettes at greater risk of respiratory illness, study suggests CUNY Graduate School of Public Health & Health Policy E Cigarettes VERIFY: Do e cigarette cartridges contain more nicotine than cigarettes?