As far as I can tell from Erowid and what-not, LSD is the safest drug out there. Cannabis can mess you up, MDMA's can mess you up, opiates can really mess you up, but as far as I can see, there is no medical problems related to LSD. Short of thinking you can fly and jumping off a building, I don't really see how this drug is harmful. Is it? And if it isn't, why is it illegal?