E cigarettes are likely to cause cancer, including in the lungs and mouth, according to a sweeping review of scientific evidence that challenges their positioning as a safer alternative to smoking. There is Evidence update on the cancer risk of vaping e cigarettes: A systematic review A comprehensive review of recent peer reviewed research provides the strongest evidence to date that using electronic cigarettes likely causes both oral and lung cancers in humans. https: modernsciences.org vaping likely causes oral lung cancer april Does Vaping Doesn't Damage Your DNA? Prof. Peter Hajek Responds Ecigclick Two top cancer organizations highlight how e cigarettes are linked with early steps in cancer development and call for flavor bans : r science E Cigarette Vapor Linked to Lung Cancer in Mice