E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Health Information Leaflet Service Australian researchers have issued one of the strongest warnings yet about vaping, saying a major review of evidence suggests e cigarettes are likely to cause lung and oral cancer. The review found signs Latest Cochrane Review finds high certainty evidence that nicotine e cigarettes are more effective than traditional nicotine replacement therapy (NRT) in helping people quit smoking Cochrane Disturbing Trends with E Cigarettes in Schools