Passive Vape Exposure From E Cigarettes Linked to Acute Health Effects in COPD Pulmonology Advisor 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, Health effects of electronic cigarettes: A review British Columbia Medical Journal Electronic Cigarette Use in US Adults at Risk for or with COPD: Analysis from Two Observational Cohorts Journal of General Internal Medicine Springer Nature Link