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, 5 ways that vaping can damage your body Silent Airway Mucus Plugs in COPD and Clinical Implications CHEST The Troubling Truth About COPD and Vaping University of Maryland Medical System Health Hub Vaping May Increase the Risk of Chronic Respiratory Disease Scientific American