Does nicotine cause cancer?
"Several lines of evidence indicate that nicotine may contribute to the development of cancer. Evidence from experimental in vitro studies on cell cultures, in vivo studies on rodents as well as studies on humans inclusive of epidemiological studies indicate that nicotine itself, independent of other tobacco constituents, may stimulate a number of effects of importance in cancer development (5, 6)."
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There are a number logical arguments and fallacies that can be made in favor of those using nicotine for the purpose outlined by the OP, but in the end there are a variety of other supplements with ingredients that can far exceed the benefits of nicotine usage. Nicotine gum is intended to help those end an addiction, not begin a new one.
That said, as stated before, one doesn't need pre-workouts, BCAAs, intra-workouts, protein drinks; bars, just good food, quality sleep, great programming, and a commitment to one's own development... Then again, give me my coffee in the morning, pre, intra, BCAA, protein, and all the other goodies because they make it at least interesting and they have their place. They give you a slight edge to be consistent and gain results where others would possibly quit.
It all has it's place.
Bottom line, it's your life, your choice. Make it, and if it works for you. Good on ya!