Health effects and known pathology associated with the use of E cigarettes ScienceDirect PET imaging shows greater lung inflammation in e cigarette users than cigarette smokers E cigarette vapor linked to cancer in mice National Institutes of Health (NIH) Use of e cigarettes after quitting smoking increases lung cancer risk Cancerworld Magazine Study finds surprising new link between vaping and cancer AOL Electronic cigarette smoke induces lung adenocarcinoma and bladder urothelial hyperplasia in mice PNAS