E cigarette users had substances linked to bladder cancer in urine, review finds Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA E cigarettes Found to Cause Change in Mouth Bacteria Which Could Lead to Gum Disease or Oral Cancer Respiratory Therapy Health professionals reluctant to recommend e cigarettes to cancer patients Dentistry.co.uk Vaping Linked to Cancer Risk: Emerging Research Sylvester Comprehensive Cancer Center posted on the topic LinkedIn Vaping can cause cancer, say researchers but still isn't as damaging as smoking cigarettes. More than 5.5 million Britons currently use e cigarettes, which have long been viewed as a safer alternative