UofL study shows nicotine in e cigarettes may not be harmless, as some claim UofL News E cigarettes with a cigarette like level of nicotine are effective in reducing smoking and exposure to carcinogen, study finds VCU News Virginia Commonwealth University E cigarettes didn't help smokers quit, study says CNN Le phnomne de la puff , cette cigarette lectronique jetable, fait des remous Electronic cigarettes: Help or hazard? Harvard Health Comparison of Nicotine Levels Between Cigarettes and Vapes Ecigator