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 Most E cigarette Users Ages 18 to 29 Never Smoked Before American Cancer Society Breast Cancer & E Cigarettes: Is Vaping a Safer Alternative to Smoking? Maurer Foundation E Cigarettes and Associated Health Risks: An Update on Cancer Potential