What is a common sign of hallucinogen abuse or overdose?

A common sign of hallucinogen abuse or overdose is the occurrence of flashbacks. Flashbacks are spontaneous recurrences of the effects of the drug, which can happen days, weeks, or even longer after the initial use. They often manifest as vivid re-experiencing of the hallucinations, altered perceptions, or feelings associated with the drug experience, even when the user is no longer under the influence of the substance. This phenomenon is particularly associated with hallucinogens such as LSD and psilocybin mushrooms, and can be distressing and disruptive.

The impact of flashbacks relates to the way hallucinogens affect the brain’s processing of sensory information, emotions, and memories. This can lead to unpredictable experiences that are outside the user's control, making awareness of flashbacks an essential component of understanding the potential long-term consequences of hallucinogen use.