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Cognitive measures in long-term cannabis users.

Harrison G Pope1, Amanda J Gruber, James I Hudson

  • 1Biological Psychiatry Laboratory, McLean Hospital/Harvard Medical School, Belmont, Massachusetts 02478, USA.

Journal of Clinical Pharmacology
|November 5, 2002
PubMed
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Long-term cannabis use may cause temporary cognitive deficits, primarily affecting memory. These effects appear reversible after a month of abstinence, not linked to cumulative lifetime use.

Area of Science:

  • Neuroscience
  • Psychology

Background:

  • Cognitive effects of long-term cannabis use remain unclear.
  • Deficits are noted post-cessation, but long-term persistence and correlation with cumulative use are debated.

Purpose of the Study:

  • To investigate whether cognitive deficits from heavy cannabis use persist long-term.
  • To determine if deficits correlate with cumulative lifetime cannabis consumption.

Main Methods:

  • Neuropsychological tests administered to 77 heavy cannabis users (≥5000 lifetime uses) and 87 controls (≤50 lifetime uses).
  • Supervised abstinence period with testing on Days 0, 1, 7, and 28.

Main Results:

  • Heavy users showed memory deficits on Days 0, 1, and 7.
  • By Day 28, significant differences between groups diminished.

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  • Few associations found between lifetime consumption and cognitive performance.

    • Conclusions:

    • Cannabis-associated cognitive deficits appear reversible.
    • Deficits are linked to recent use rather than cumulative lifetime exposure.
    • Findings suggest recent exposure is a key factor in temporary cognitive impairment.