i recently came upon the ratio of how much it takes to get u high to how much it takes to kill you. the ratio is 1/43,000 so one being how much it takes to get you high you would have to consume 43000 times that much in a single session to od. ITS NOT PYSICALLY POSSIBLE. Even if it was possibe to concentrate THC to that level and kill someone, it wouldnt be "marijuana" anymore it would be pure THC.