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Halpern JH, Pope HG Jr. 
“Do hallucinogens cause residual neuropsychological toxicity?”. 
Drug Alcohol Depend. 1999 Feb 1;53(3):247-56.
We collected and reviewed studies in which neuropsychological tests were administered to users of LSD or other hallucinogens. Interpretation of the studies is limited by various confounding variables, such as subjects' premorbid cognitive and personality function and prior use of other substances. At present, the literature tentatively suggests that there are few, if any, long-term neuropsychological deficits attributable to hallucinogen use. To better resolve this issue, however, it will be important to study larger samples of chronic, frequent hallucinogen users who have not often used other types of drugs.
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