NEW YORK (Reuters Health) Mar 06 – Adding to the controversy about the long-term effects of marijuana use, results of a new neuropsychological study indicate that long-term use is associated with impaired memory and attention, which lasts beyond intoxication and becomes worse with continued use.
Dr. Nadia Solowij, from the University of New South Wales, Sydney, Australia, and colleagues studied 102 near-daily marijuana users undergoing treatment for drug dependence. Among these subjects, 51 had used marijuana for a mean of 23.9 years and 51 had used marijuana for a mean of 10.2 years. The researchers compared these subjects with 33 individuals who had never used marijuana.
The subjects underwent neuropsychological tests, which measured memory, attention, and executive functioning. The tests were given before the subjects began the treatment program after a median of 17 hours of abstinence, according to the report in The Journal of the American Medical Association for March 6.
Compared with short-term marijuana users and controls, subjects who were long-tern marijuana users performed significantly worse on the tests that examined memory and attention. …
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