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, Frontiers Chronic obstructive pulmonary disease (COPD) and COPD like phenotypes E Cigarettes May Cause COPD. Here's Why Prince Court Medical Centre E Cigarette or Vaping Product Use Associated Lung Injury: A Comprehensive Review Chronic Bronchitis Vs Emphysema Association of electronic cigarette use and risk of COPD: a systematic review and meta analysis npj Primary Care Respiratory Medicine