Most edibles I've heard of are some sort of marijuana. I'm clueless enough about that world that it may apply to anything in food, like mushrooms or other psychedelics.
We smoked pot a great deal in college, one of our good friends was open to trying but didn't want to smoke. We made a pan of brownies, while stoned, and burned the crap out of them. When I saw him the next year, he was no longer reluctant to smoke.