I think the persons general metabolism is also a big variation for the daily stoner.
Personally I'm skinny, have pretty much no fat and little muscle. Also I walk everywhere I go, probably cover 3/4/5 miles on a day when I'm out so I don't find tolerance a problem to much. If your a big guy though then that's going to be a big part of it.
THC sticking to fat or someting like that.
And yea quality of the bud and the method of use.
:stoned:Just have a break:stoned: