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, Vaping' Increases Odds of Asthma and COPD Johns Hopkins Medicine Inhalation Toxicology of Vaping Products and Implications for Pulmonary Health What COPD Patients Should Know About Vaping and E Cigarettes LPT Medical Health effects in COPD smokers who switch to electronic cigarettes: a COPD Dove Medical Press