I was introduced to chewing betel nut by a driver in Palau and the nut comes from the areca palm tree, which is native to southeast Asia and Micronesia. The nut is cut in half, the pit removed, lime juice is squeezed on it, tobacco is taken from a Marlboro cigarette and broken in the cavity, it is then wrapped in betel leaf, which is a peppery-tasting liner. This nut is famous for its stimulating properties once you put it between cheek and gum (be careful not to chew on it too much for first timers), which far exceeds any chewing tobacco you have tried, as well as for the distinctive dark stain it leaves on the teeth of long-time users, which is a symbol of the good life in Palau.  Betel nut chewing can be dated back to the 1st century and creates a stimulant effect and mild euphoria. It also results in strong salivation, which enthusiasts consider a desirable part of the experience.  It is used liked coffee among men, and occasional women.  Interestingly, while the nut stains the teeth red, long-time betel nut chewers have a significantly lower incidence of dental cavities than non-chewers, though it may increase the risks of cancer, while the jury is still out on this one.