hey, i think metabolism has everything to do with how fast your body gets rid of thc. im 5 8, 125 lbs and work out twice a week, I smoked a fat blunt on a friday, took a pee test on the following monday (thought for sure i was gonna fail), and sumhow passed... if you search around on google, i found a site that sells thc tests for like 75 cents each. if your that worried, you should buy a couple of those and figure out how fast you will test negative