Quote Originally Posted by Nullific
It doesn't NEED to be heat 'activated', when marijuana is heated as in cooking a process called decarboxylization occurs in which a carboxyl (COOH) group is destroyed leaving a form of THC more appropriate for GI absorbtion. You can get effects from eating raw cannabis, you would just need to eat more of it.
I didnt bother reading past the first page I just wanted to say that this is the correct answer. The Green Dragon thread can explain in detail, but heating it merely turns it from TetraHydraCannibolic Acid to our beloved delta9TetraHydraCannabinol