Smoking Status and COPD Symptoms and Prognosis Journal of the COPD Foundation Exclusive E cigarette Use Significantly Associated with COPD RT 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, 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