Position Statement: Passive Tobacco Smoke and E Cigarette Emissions Lung Foundation Australia Vaping Related Illness and Lung Disease NEJM Nicotine in electronic cigarettes Journal of Umm Al Qura University for Applied Sciences Springer Nature Link A new study published in Nicotine & Tobacco Research found that those using e cigarettes alone were more than twice as likely to develop COPD than people who didn't use any tobacco products, How Many Packs of Cigarettes are in a Vape? E cigarettes: How safe are they? BBC News