E cigarettes Found to Cause Change in Mouth Bacteria Which Could Lead to Gum Disease or Oral Cancer Respiratory Therapy Vaping and the use of e cigarettes are likely to cause cancer, according to a new study published by the University of New South Wales on 30 March. The study, which brought together Adolescents and E cigarette Use: Long term Effects, Behaviors and Lung Injury Youth Know the Risks Vaping harms your health Cancer Institute NSW Teens inhale cancer causing chemicals in e cigarettes