Comparison impact of cigarettes and e cigs as lung cancer risk inductor: a narrative review Chronic electronic cigarette exposure in mice induces features of COPD in a nicotine dependent manner Thorax 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, Smoking vs vaping what are the key differences? Evapo