E cigarette smoke damages DNA and reduces repair activity in mouse lung, heart, and bladder as well as in human lung and bladder cells PNAS Vaping harms your health Cancer Institute NSW Optimising messages and images for e cigarette warnings Tobacco Control Adverse effects of electronic cigarettes on the disease naive oral microbiome Science Advances E cigarettes: 'cancer risk close to zero' The Mail & Guardian E cigarettes cause 'significantly less damage to our DNA than cigarettes'