Ever considered ingesting huge amounts of pre-heated weed?
2-3 grams or so, heated in butter, then eat a slice of bread with that on it?
Be prepared to lie on the floor, not being able to move, all visible colors faded to greys, wondering about things most of the time.
It will possibly make you tired for days, because of that 18h half-life of THC, but the best answer to tolerance is adding weight