"E-cigarettes, and other electronic nicotine delivery systems (ENDS) - including vapes, vaporizers, vape pens, hookah pens, mods, and e-pipes - are growing in popularity globally. It is becoming increasingly clear that there are significant health consequences of using e-cigarettes, such as lung and kidney disease as well as damage to heart cells, but many of them remain unknown. The long-term health consequences are largely a mystery because of the relatively short history of the e-cigarette"--.