Where do you live that you "Always see these for sale or hear commercials for them."? While in the Army I spent some time in SE Asia. The locals would mix this crude (but tremendously effective) mountain tobacco with pot and smoke it. Sometimes they would just take a poke of the tobacco alone. It would get your head spinning more than the pot. Er...ah..that's what I heard, anyway. BTW, do you know the Thai word for bong?
It's bong.