The Health Impacts of E Cigarettes Electronic cigarettes: Help or hazard? Harvard Health Smokers switching to e cigarettes have an increased heart attack risk, says ICMR study: Why quitting smoking is the only way out Knowledge and use of e cigarettes among nursing students: results from a cross sectional survey in north eastern Italy BMC Public Health Springer Nature Link E cigarette use and respiratory symptoms in adults: A systematic review and meta analysis E cigarettes present risk to teenage health as new research sparks concern over number of users Daily Record