A new nicotine epidemic is surging as 1.5 million new teen users in 2018 started using ecigarettes/vaping driving the teen total to 5 million.
Using nicotine in adolescence can harm the parts of the brain that control attention, learning, mood, and impulse control. The aerosol itself that sprays nicotine has VOCs, cancer causing chemicals, and has little research or regulation.
Altria, the US maker of Marlboro cigarettes, invested $12.8bn in the e-cigarette maker Juul this year, buying a 35% stake in the company.
https://www.theguardian.com/society/2019/feb/11/american-teenage-e-cigarette-use-cdc-study