I was reading this thread and thinking hmm sort of a dumb question but valid and then i went back and misread the question as why do you get cottonmouth...after correcting my thought i began to ponder that my self. yea i know our saliva glands dry up and crap but why do that happen with weed. it happens when you run and exercise because of dehydration; your body sends the fluid to other places like sweat glands... however when i smoke i dont tend to sweat a lot of produce much of any fluid. any have an answer for me or am i over thinking all this crap?