The LD50 was extensively document, your claim is essentially vodoo.
These were the evaluation criteria: drug-specific and drug-related mortality, drug-specific and drug-related damage, dependence, drug-specific and drug-related impairment of mental functioning, loss of tangibles, loss of relationships, injury, crime, environmental damage, family adversities, international damage, economic cost, and community harm.
Infographic: http://media.economist.com/sites/default/files/imagecache/or...
Original study: Drug harms in the UK: a multicriteria decision analysis http://www.sg.unimaas.nl/_old/oudelezingen/dddsd.pdf
As a result of my "research", LSD remains one of the few recreational drugs that I might ever consider trying in the future, given the correct circumstances.
It is certainly less harmful than nicotine, ethanol, and acetaminophen. But now that marijuana is legal in some states, I expect that it will soon displace LSD-25 as the least harmful recreational drug that I know about.
If you are also curious, my conclusion was that LSD-25 is probably present in AUM at a psychoactive, but non-hallucinogenic, dose, mostly as an adjuvant for the other ingredients. It would help bridge the gap between a drug known to have powerful, positive, short-term effects and one known to cause long-term but very unpredictable changes in behavior.
Conclusion: We did not find use of psychedelics to be an independent risk factor for mental health problems.
