Angel Dust is a slang term for Phencyclidine, or PCP. PCP was first synthesized in 1926 and was briefly used as a human anesthetic in the 1950's before being withdrawn from the market because of the acute hallucinations experienced by patients under the influence of the drug.
PCP falls into the category of psychoactive drugs called dissociatives and should be separated from traditional hallucinogenic/psychedelic drugs which are typically tryptamines and phenethylamines. PCP is closely related to DXM, ketamine, salvia divinorum, and nitrous oxide, all weaker dissociatives of different potencies. PCP is the strongest of the commonly abused dissociatives and is potentially much more physically damaging than the rest of the drugs in this classification.
Typical effects of Angel Dust include:
It is worth noting that PCP and other dissociatives are not related to traditional indole and catechole hallucinogens, which are typically much safer and have not been shown to pose much of a health risk except to individuals who have a history of mental disorder in their family.