I heard somewhere that the University of Washington did a study and found that your body abosrbs all the THC in a hit by 12 seconds. Although I can't verify this, living in the seattle area the UW is our most reliable place for info on medical pot so..... take it or leave it but whenever I hold in a hit I wonder if it is true or not. My little trick for getting higher is to take a tiny bit of resin and roll a bowl around it so it soaks into the weed. mmm makes it last longer and get higher though it might not taste as good.