Electronic Cigarettes and Vaping: Factsheet Positive Choices While vaping is not risk free, it is less harmful than tobacco Our World in Data E cigarettes can cause cancer even when they are nicotine free, scientists claim The Mirror E cigarettes Found to Cause Change in Mouth Bacteria Which Could Lead to Gum Disease or Oral Cancer Respiratory Therapy Just Like Cigarettes, Vaping Likely Causes Cancer, Major Study Finds Most E cigarette Users Ages 18 to 29 Never Smoked Before American Cancer Society