Some people using hallucinogenic drugs can re-experience the effects of the drug days, weeks, or even years after they used it. This is called hallucinogen persisting perception disorder (HPPD). These ...
Hallucinogen-persisting perception disorder (HPPD) causes a person to keep reliving the visual element of an experience caused by hallucinogenic drugs. A person with HPPD has frequent visual ...
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