Combine the two estimates at their most conservative, add a tad of fudge factor, and heavy vaping use will at worst cost you two months of healthy living. People regularly make worse tradeoffs than this - obesity, amount and recklessness of driving, playing professional American Football, and many others are likely worse.
Whether or not that counts as "safe" is up to you and your risk tolerance, of course. As a non-smoker, that's safe enough for me to try vaping to see if nicotine a stimulant worth using.
The NHS estimates that vaping is no more than 5% of the danger of smoking.
(https://www.nhs.uk/smokefree/help-and-advice/e-cigarettes)
Heavy smoking is roughly the equivalent of losing somewhere between one and three healthy years of life.
(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1361023/)
Combine the two estimates at their most conservative, add a tad of fudge factor, and heavy vaping use will at worst cost you two months of healthy living. People regularly make worse tradeoffs than this - obesity, amount and recklessness of driving, playing professional American Football, and many others are likely worse.
Whether or not that counts as "safe" is up to you and your risk tolerance, of course. As a non-smoker, that's safe enough for me to try vaping to see if nicotine a stimulant worth using.