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A longitudinal study of marijuana effects.

J A Halikas, R A Weller, C L Morse

    The International Journal of the Addictions
    |May 1, 1985
    PubMed
    Summary
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    Long-term marijuana use shows shifting effects. Initial desirable cognitive and mood effects became less frequent, while undesirable ones increased over 6-8 years.

    Area of Science:

    • Psychology
    • Neuroscience
    • Cannabis Research

    Background:

    • Marijuana's effects are widely discussed but long-term changes are less understood.
    • Previous research often focused on acute effects rather than longitudinal user experiences.

    Purpose of the Study:

    • To investigate how the perceived effects of regular marijuana use change over a 6-8 year period.
    • To identify specific patterns of differential effects in long-term cannabis consumers.

    Main Methods:

    • Longitudinal study involving 100 regular marijuana users interviewed initially (1968-1970) and reinterviewed 6-8 years later (97 participants).
    • Utilized a checklist of 105 marijuana effects for detailed self-reporting at both time points.

    Main Results:

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    • Significant decrease in reported sensory and hallucinatory effects over time.
    • Stable reports for appetite, sexual, and sleep-related intoxication effects.
    • Shift in cognitive, mood, and sleep aftereffects from desirable to undesirable, with decreasing frequency of positive experiences.

    Conclusions:

    • Long-term regular marijuana use is associated with evolving subjective effects.
    • Perception of cannabis-induced cognitive and mood alterations may become less favorable over time.
    • Findings highlight the dynamic nature of cannabis effects in chronic users.