i have a definite reverse tolerence to mj...when i began to smoke some years ago, it took a lot to get me high, to recgnize the high...now i only take one puff and i am stoned...reverse tolerence is when you need less to feel the effect...not to get satisfied with it...try it i am sure it's the same for everybody...take only one good puff and you'll feel the high if look for it...of ourse it is not as fun as getting fucking balzed all over your mind!! but still scientifically speaking MJ is a drug that creates a reverse tolerence...