tolerance is all mental, but like, you smoke a shit load of pot at once, of course, being a little high isn't going to feel like much, and you keep this up, a little just won't feel right any more. I guess thats a tolerance. BUt after like a year of heavy use, i could still feel something after 2 or 3 hits, but it wasn't like a complete high. Except now, i don't find my self getting "high" at all like i used to. Its more like drinking now for me