GhostQlyph: Let me see here... Looks like this website is his only claim to fame! He was a medical examiner for almost his entire career and never actually studied these effects -- which is shown by the ridiculously sparse and inaccurate information on display and the lack of any published papers!
EDIT: That means this source isn't reliable. Find me a peer-reviewed paper, or at least an article based on one. When even the DEA, notorious for their lies about drug effects, says that LSD causes no permanent damage, you're probably wrong.
Licurg: Will Wikipedia do ?
http://en.wikipedia.org/wiki/LSD#Potential_adverse_effects It is physiologically well tolerated and there is no evidence for long-lasting physiological effects on the brain or other parts of the human organism.[47]
LSD may temporarily impair the ability to make sensible judgments and understand common dangers, thus making the user more susceptible to accidents and personal injury. It may cause temporary confusion, difficulty with abstract thinking, or signs of impaired memory and attention span.[48]
From your link.
Thank you!
EDIT: In case it wasn't clear: Wikipedia is saying that TEMPORARY effects can be bad. Absolutely.
But once it's out of your system, it's out of your system.
The citations seem sound on that. I'll get back to you on the questionable bollocks below it.
EDIT2: Nope, all looks good. Maybe you missed some spots though.
From "psychosis":
However, in neither survey study was it possible to compare the rate of lasting psychosis in these volunteers and patients receiving LSD with the rate of psychosis found in other groups of research volunteers or in other methods of psychiatric treatment (for example, those receiving placebo).
Cohen (1960) noted:[56]
"The hallucinogenic experience is so striking that many subsequent disturbances may be attributed to it without further justification. The highly suggestible or hysterical individual would tend to focus on his LSD experience to explain subsequent illness. Patients have complained to Abramson that their LSD exposure produced migraine headaches and attacks of influenza up to a year later. One Chinese girl became paraplegic and ascribed that catastrophe to LSD. It so happened that these people were all in the control group and had received nothing but tap water."
From "flashbacks":
Any attempt at explanation must reflect several observations: first, over 70 percent of LSD users claim never to have "flashed back"; second, the phenomenon does appear linked with LSD use, though a causal connection has not been established; and third, a higher proportion of psychiatric patients report flashbacks than other users.[57] Several studies have tried to determine how likely a user of LSD, not suffering from known psychiatric conditions, is to experience flashbacks.
I admit HPPD is one thing that seems to have a load of evidence going for it, but consider the incidence of it among chronic LSD users is around 4.1%. Meanwhile,
http://en.wikipedia.org/wiki/Alcoholic_liver_disease has an incidence of 15-20%.
All of the citations for the stuff I mention above seem to be reasonably decent at a cursory glance.