sorry, there is no chemical in marijuana for the body to build a physical addiction on... atleast not in any way anyone ever thinks physical addiction.... at the absolute strongest i've heard yet.... would be melatonin levels, and even that is still more of a mental addiction.. it doens't make you crave weed.... it doesn't do an whole entirely lot either....

anyways, again you're barking up the wrong tree... just cuz you have a tendancy to seek dependation upon mind altering substances doesn't make it physically addictive.....