Tolerance for LSD is short-lived it is lost if the user stops taking the drug for several days. There is no evidence that LSD produces physical withdrawal symptoms when chronic use is stopped.
Two long-term effects persistent
psychosis and hallucinogen persisting perception disorder (HPPD), more commonly referred to as "flashbacks," have been associated with use of LSD. The causes of these effects, which in some users occur after a single experience with the drug, are not known.
Psychosis
The effects of LSD can be described as drug-induced psychosis-distortion or disorganization of a person's capacity to recognize reality, think rationally, or communicate with others. Some LSD users experience devastating psychological effects that persist after the trip has ended, producing a long-lasting psychotic-like state. LSD-induced persistent psychosis may include dramatic mood swings from mania to
profound depression, vivid visual disturbances, and hallucinations. These effects may last for years and can affect people who have no history or other symptoms of psychological disorder.
Hallucinogen Persisting Perception Disorder
Some former LSD users report experiences known colloquially as "flashbacks" and called "HPPD" by physicians. These episodes are spontaneous, repeated, sometimes continuous recurrences of some of the sensory distortions originally produced by LSD.
The experience may include hallucinations, but it most commonly consists of visual disturbances such as seeing false motion on the edges of the field of vision, bright or colored flashes, and halos or trails attached to moving objects. This condition is typically persistent and in some cases remains unchanged for years after individuals have stopped using the drug.
Any of this ring any bells Kx ? One minute you're raging on about something or other, the next your bleating on about people picking on you, then you're all pally, pretty much what the above says. For more details see the link below :-
Effects of LSD - What Are the Effects of LSD?