E cigarettes Found to Cause Change in Mouth Bacteria Which Could Lead to Gum Disease or Oral Cancer Respiratory Therapy Many people believe that vaping is less harmful than smoking, but that's a common misconception. In fact, in addition to nicotine, vapes can contain toxic chemicals that could be linked to cancer, CoEHAR Replica study: "Claim that e cigarette aerosols make cancer cells more resistant to chemotherapy debunked!" CoEHAR Vaping and Throat Cancer: What You Need to Know Medical Marijuana Vape Pen: A Discreet and Fast Acting Option for Everyday Relief