i seriously believe in a thing called counter tolerence (i think thats what its called anyway) cause when i buy a bag as i get through it i get the same high from less and less. i strongly believe that tolerence is actually all in the mind when things such as enviroment and the people you are with can effect your high so drasticly. I think its the way that you toke which effects how high you get and i dont mean using different methods such as bong, blunt, pipe etc.