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Re:Acute Effects of Electronic Cigarette Aerosol Inhalation ... by ceejayoz on Wednesday August 21, 2019 @03:32PM (#20760746)
Vaping appears to have stalled progress towards smoking cessation:

https://www.apnews.com/1c899ae55fca41bab3cefcdc37bf6de4

> For decades, the percentage of high school and middle school students who smoked cigarettes had been declining fairly steadily. For the past three years, it has flattened, according to new numbers released Monday.

It may also encourage relapses:

https://www.reuters.com/article/us-health-ecigarettes/vaping...

> Adults who smoke cigarettes may have an easier time cutting back or quitting altogether if they start vaping, but a new French study also suggests that vaping may make ex-smokers more likely to relapse.

Re:Acute Effects of Electronic Cigarette Aerosol Inhalation ... by jdietrich on Wednesday August 21, 2019 @06:59PM (#20762832)
From your first link:

“It’s not clear yet what’s going on and it’s best to not jump to any conclusions,” said David Levy, a Georgetown University researcher.

In the UK, teenage smoking is at record lows - just 16% of secondary school children have ever smoked tobacco, down from 19% in 2016. We have not seen a significant rise in youth e-cigarette use. This may have something to do with the 2014 Tobacco Products Directive, which introduced substantial new regulation on both cigarettes and e-cigarettes including restrictions on advertising.

https://www.bbc.co.uk/news/health-49398630

https://en.wikipedia.org/wiki/Tobacco_Products_Directive