rechargeable cigarettes A Guide to E – SMOKO E-Cigarettes + Vapes The future of smoking: E-cigarettes
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Vaping has also been linked to serious lung injuries, like bronchiolitis obliterans, often called popcorn lung

"Menthol Capsules in Cigarette Filters - Increasing the Attractiveness of a Harmful Product" (PDF)

GBD 2015 Tobacco Collaborators

There are more than 5,000 chemical components found in cigarette smoke and hundreds of them are harmful to human health
There are likely some damaging respiratory and cardiovascular effects associated with vaping, so relatively less harmful didn't mean without harm

USA 95 , 1054110546 (1998)