E cigarettes Found to Cause Change in Mouth Bacteria Which Could Lead to Gum Disease or Oral Cancer Respiratory Therapy 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 Adolescents and E cigarette Use: Long term Effects, Behaviors and Lung Injury E Cigarette Smoke Causes Lung Cancer in Mice NYU Langone News Vaping harms your health Cancer Institute NSW