Vaping Equals 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 Cancer causing Chemical Formed in E cigarette Users School of Public Health University of Minnesota Breast Cancer & E Cigarettes: Is Vaping a Safer Alternative to Smoking? Maurer Foundation Electronic Cigarettes and Vaping: Factsheet Positive Choices