May I ask for a source on that? AFAIK the reason why cigarettes cause disease is because of the tar and all of the other byproducts of the Burning tobacco and that nicotine by itself is not the cause. I can't find a source of the top of my head but I smoked cigarettes for 4 years and enjoyed reading on them.
In case anyone on HN reads this as saying that nicotine is safe to use, the end of that article is fairly clear:
> Although more studies on health effects of nicotine in humans are required, based on in vitro and in vivo effects of nicotine, patients should be advised not to use nicotine products during cancer treatment unless it is temporarily needed to stop tobacco smoking.
