I know it's psilocybin that causes the effect, psilocybin was what I was refering to in the first place.
It takes half your body weight to OD on mushrooms. 150 Lbs person needs 75 if you find me anyone who could eat even a half pound before puking, I'd be impressed. They are posion but really they are not, even water can kill you if you drink enough.
i once talked to this "gangsta" kid for an hour about how the "mescaline" that he used to get blotter sheets of wasn't actually mescaline.