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, Are E Cigarettes a Safe Alternative to Smoking? Using Airway Cell Cultures to Assess Early Indicators of COPD Progression Inquiries Journal 5 ways that vaping can damage your body What Are The Side Effects Of A Vape Vaping and Electronic Cigarette Toxicity Overview and Recommendations ( Dynamic Chemistry and Toxicity of E Cigarette Aerosols and Their Product Waste Chemical Research in Toxicology 5 year longitudinal study finds e cigs and cigs have similar risks for respiratory disease and COPD; dual use is worse Stanton Glantz blog