While LSD has very few known direct physical risks, the drug has many mental risks due to its mind altering properties. 

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Even months or years after LSD is taken, users can suffer from persistent psychosis, or dissociation with the real world. Those who have a history of mental health problems are especially susceptible to this illness. LSD users also can suffer from Hallucinogen Persisting Perception Disorder, which is characterized by intense flashbacks to acid trips.

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While under the influence of Acid, Users of the drug suffer from impaired judgement which could potentially lead to death due to risky decision making.