This is something that i've always wondered. Why do psychodelic chemicals in plants make you trip, for what evolutionary reason? Is it to scare animals away from eating them? Yet we consume them intentionaly for fun, and pleasure. So I'm thinking maybe that since we injoy them so much, that we harvest them and keep them in existence. Perhaps both these reasons are why. It could have started as a defense mechanism for survival, and ended up being harvested and kept in existence. Anyone else have any opinions?