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, How Many Packs of Cigarettes are in a Vape? Nicotine delivery to users from cigarettes and from different types of e cigarettes Psychopharmacology Springer Nature Link Tobacco Control Chronic Disease Prevention & Health Promotion Division Electronic Cigarettes Vaping Around Children Exposes Less Nicotine Than Smoking Ecigator