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There isnt one clear answer because several factors affect how long nicotine or cotinine stays detectable

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Martin, You are right to wonder about your son's use of chewing tobacco

- Betel chewing used to be prevalent in the Philippines, from the Cordillera mountains in the north to the Muslim communities in the south

Epidemiology At least 5X more common is men with the male/female ratio varying markedly worldwide, probably representin the variable exposure to environmental factors At least 4X more common in blacks in the U.S., with the incidence in blacks rising while the incidence in whites is stable or declining A disease of older people with a mean age of onset of 60 yrs