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Other potential benefits notwithstanding, nicotine is most definitely toxic:

https://fscimage.fishersci.com/msds/96314.htm

https://www.acmt.net/Nicotine.html

Yes nicotine is toxic, I tried to compare it with caffiene, and it sounds like 5g of caffiene could kill you, whereas it might only take 0.5g of Nicotine.

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