5 year longitudinal study finds e cigs and cigs have similar risks for respiratory disease and COPD; dual use is worse Stanton Glantz blog Vaping and COPD: Is it okay or can it cause more problems? COPD Dove Medical Press 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, The Updated Meta Analysis of E Cigs & Health Outcomes: Still Critically Flawed