<unk>  or phenylcyclohexyl piperidine <unk> , also known as angel dust among other names, is a dissociative hallucinogenic drug used for its mind-altering effects.<unk>  may cause hallucinations, distorted perceptions of sounds, and violent behavior. As a recreational drug, it is typically smoked, but may be taken by mouth, snorted, or injected. It may also be mixed with cannabis or tobacco. Adverse effects may include seizures, coma, addiction, and an increased risk of suicide. Flashbacks may occur despite stopping usage. Chemically,<unk>  is a member of the arylcyclohexylamine class, and pharmacologically, it is a dissociative anesthetic.<unk>  works primarily as an NMDA receptor antagonist.<unk>  is most commonly used in the United States. While usage peaked in the US in the 1970s, between 2005 and 2011 an increase in visits to emergency departments as a result of the drug occurred. As of 2017 in the United States, about 1% of people in grade 12 reported using<unk>  in the prior year while 2.9% of those over the age of 25 reported using it at some point in their lives.
Phencyclidine
Cocaine 
Cocaine
Benzocaine
Cannabis 
Cannabis
Heroin
Methamphetamine