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by mparr4 5475 days ago
The LD50 (lethal dose for 50% of the population) for psilocybin cubensis being consumed by a 150lbs person is 3015g (over 6 lbs!). A "high" dose is anything over an eighth of an ounce (~3.5 grams). That's quite a large difference between drug and poision!

Link: http://www.erowid.org/plants/mushrooms/mushrooms_chemistry.s...