LSD is the most potent (effective at lowest doses) of all the hallucinogens.its 10,000 times more potent then mescaline. In Science 30 April 1972, Volume 172 Number 3982 p. 431-440 there was an article by Norman I. Dishotsky, William D. Loughman, Robert E. Mogar and Wendell R. Lipscomb titled "LSD and Genetic Damage - Is LSD chromosome damaging, carcinogenic, mutagenic, or teratogenic?". They reviewed 68 studies and case reports published 1967-1972, concluding "From our own work and from a review of literature, we believe that pure LSD ingested in moderate doses does not damage chromosomes in vivo, does not cause detectable genetic damage, and is not a teratogen or carcinogen in man." Well, there's the study by Sidney Cohen which was cited here recently, Journal of Nervous and Mental Disease, 130, 1960. The following is from Jay Stevens' Storming Heaven: "Cohen surveyed a sample of five thousand individuals who had taken LSD twenty-five thousand times. He found and average of 1.8 psychotic episodes per thousand ingestions, 1.2 attempted suicides, and 0.4 completed suicides. 'Considering the enormous scope of the psychic responses it induces,' he concluded, 'LSD is an astonishingly safe drug.'" http://www.xs4all.nl/~4david/lsd.html

Anything that you can take that will make you hallucinate, is harmful to you. Edit: I love it when brain dead assholes down rate me for an answer like this. This is a pure fact. I don't give a shit if you don't like it.

DMT is the most powerful hellucinegetic. It is in every living organism. We produce it in our sleep during heavy REM sleep. Without it we could not dream. And without dreams we would all go crazy and die, or post comments like Darryl61. Nobody has died from taking Hellucigens. So the idiot that posted the first answer obviously has a small penis. Yes, many people have died from doing stupid shit AFTER taking them, but millions of people die every year from the after effect of drinking too much alcahol or smoking too many cigarettes.