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Marijuana use and mortality

S Sidney1, J E Beck, I S Tekawa

  • 1Division of Research, Kaiser Permanente Medical Care Program (Northern California Region), Oakland 94611, USA.

American Journal of Public Health
|April 1, 1997
PubMed
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This study found that current marijuana use had little effect on non-acquired immunodeficiency syndrome (AIDS) mortality in men and total mortality in women. However, an association with AIDS mortality in men was likely due to confounding factors, not direct causation.

Area of Science:

  • Epidemiology
  • Public Health
  • Substance Use Research

Background:

  • Understanding the long-term health effects of marijuana use is crucial for public health.
  • Previous research on marijuana and mortality has yielded mixed results.
  • This study investigates marijuana's impact on mortality within a large healthcare-based cohort.

Purpose of the Study:

  • To determine the association between marijuana use and overall mortality.
  • To assess the relationship between marijuana consumption and acquired immunodeficiency syndrome (AIDS) mortality.
  • To examine these relationships in a cohort of adults aged 15-49.

Main Methods:

  • A cohort of 65,171 individuals from Kaiser Permanente Medical Care Program were surveyed on smoking habits, including marijuana use, between 1979-1985.

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  • Mortality follow-up was conducted through 1991.
  • Statistical analyses, including relative risk (RR) and confidence intervals (CI), were used to assess associations.

    • Main Results:

    • Current marijuana use showed no significant increase in non-AIDS mortality for men (RR=1.12) or total mortality for women (RR=1.09).
    • An increased risk of AIDS mortality in men (RR=1.90) was observed, but likely due to confounding by homosexual behavior, not direct causation.
    • Further analysis using an AIDS database supported the lack of a causal link between marijuana use and AIDS mortality in men.

    Conclusions:

    • Marijuana use demonstrated minimal impact on non-AIDS mortality in men and total mortality in women within this cohort.
    • The observed association between marijuana use and AIDS mortality in men was likely confounded and not causal.
    • These findings contribute to understanding the complex relationship between marijuana use and health outcomes.