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, Understanding Breathing Challenges in COPD and Asthma Association of electronic cigarette use and risk of COPD: a systematic review and meta analysis npj Primary Care Respiratory Medicine New Study Links Vapour Exposure to Acute COPD Symptoms Vaping Post