weed when dryed will soil and rot, get mold and stink if u get it wet and dry, wet and dry... Just stupid.
What exactly do you think happens to normal compost products?
That is how you make compost...get things wet, and warm, and let them sit and rot. The idea is that bacteria and other decomposer organisms break down the complex molecules that form living tissues and whatnot, leaving behind much simpler forms that are more easily used by the plants.
I see the general idea that the OP is going for...using the assumption that a majority of the crap in our soils does get taken into the plant (which is why we don't like the bad chemicals in there), it is not a huge leap in logic to assume that perhaps using a compost that already has many of the "good" chemicals might lead to a more potent bud.
However...I don't think it would really work. I have no evidence to back it up, but I imagine the THC and pretty much every other chemical created by the grown plant will probably decompose faster than the plant matter itself, and leave you with regular old compost.
I could very well be wrong about this, as different composts do have different ratios of nutrients and probably other chemicals as well. I'm just saying you won't see me turning a pound of good weed into compost any time soon. might be worth a try to do it with all your "garbage" after harvest.