You spoke of LSD in the GP and that is what I am speaking of. Of course there are no stories of overdoses of marijuana, but that's a straw man because, again, you spoke of lsd.
Did it ever occur to you that those who trip and dont come back can't tell you what they did because they're gone? A large number of mentally destablized homeless in the San Fran area from the Haight-Ashbury era seem to suggest that there are serious long-term effects with the ingestion of LSD.