I wonder the same thing. I can't imagine anyone would would buy spice if they had access to weed the same goes for everything else like that. I never had good luck with salvia but I know that if I could have gotten mushrooms at the store, I never would have bothered with it in the first place.

Kratom is supposed to have some benefits but I haven't tried it. They say it helps people who are addicted to opioids deal with their cravings though.