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 Can Vaping Cause Lung Cancer? What We Know So Far Beaufort Memorial Electronic cigarette smoke induces lung adenocarcinoma and bladder urothelial hyperplasia in mice PNAS Vaping and smoking together increases lung cancer risk fourfold