Nicotine has been noted to directly cause cancer through a number of different mechanisms such as the activation of MAP KinasesAs to the idea that nicotine being directly carcinogenic, I would ask that you provide a study proving that. There are a few caveats to that request:
1) The study must be about nicotine only, pharmaceutical or reagent grade, and not tobacco.
2) The study must not burn this nicotine. Smoke causes cancer, on it's own.
3) The subject must not be cancerous in the first place. Using already cancerous cells to prove something is a carcinogen is cheating.
My guess is that you won't find one. Every study I have ever seen that supposedly proves that nicotine is a carcinogen has actually been either about smoke, tobacco extracts, or a study on human tumor cells implanted into rats.
http://www.wjgnet.co...12/i46/7428.htm
There are a lot of other studies on its indirect effects on promoting pre-existing cancers if you are interested.. In particular it appears to inhibit the induction of apoptosis of cancer cells.
Edited by katuskoti, 15 March 2014 - 02:18 AM.