Nicotine is a neurotoxin (nerve poison) that is only lethal (deadly) in very high concentrations (amounts). Like with many poisons, it works stimulating (wakes you up) at low doses and there may be medical uses for it.
It is known to be highly addictive due to its neural activity (impact on the brain) and is a possible carcinogen (cause of cancer) of low strength. It is important to state that if you consume it by smoking cigarettes, everything else gives you cancer much much more quickly than the nicotine.
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