Melanin production, glutamine

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Apparently, black smokers are several times more likely to indulge in menthol cigarettes. Since menthol indirectly stimulates the production of glutamine, I was wondering if this indicates that melanin production increases the system's demand for glutamine. It's as likely as anything to be a cultural coincidence, but I'm curious.

I used to work in a gas station, and sold tons of cigarettes, its pretty much a cultural/image thing