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Updated: Jun 17, 2026

Administration of Δ9-Tetrahydrocannabinol (THC) in Adolescent and Adult Mice
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Marijuana use in adolescence.

Roger S Tonkin1

  • 1Department of Pediatrics, University of British Columbia, Vancouver, British Columbia.

Paediatrics & Child Health
|January 5, 2010
PubMed
Summary
This summary is machine-generated.

Adolescent marijuana use has increased, with earlier initiation and higher frequency observed. This study challenges the notion of marijuana as a safe recreational drug, highlighting associated risks.

Keywords:
Early adolescenceMarijuanaRisky behavioursSubstance use

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Area of Science:

  • Public Health
  • Adolescent Medicine
  • Psychology

Background:

  • Adolescent marijuana use has shown a significant overall increase in recent decades.
  • Changes in marijuana use patterns, particularly among early adolescents, have been noted.

Purpose of the Study:

  • To examine the clinical and psychosocial implications of early-onset marijuana use in adolescents.
  • To report differences in risky behaviors between adolescent marijuana users and nonusers.

Main Methods:

  • Analysis of health status and risk behaviors among students in grades 7 to 12 in British Columbia.
  • Comparison of marijuana use patterns, age of onset, and frequency between user and nonuser groups.

Main Results:

  • An earlier age of onset and increased frequency of marijuana use were observed among adolescents.
  • Significant differences in risky behaviors were identified between adolescent marijuana users and nonusers.

Conclusions:

  • The study challenges the perception of marijuana as a safe recreational substance.
  • Early-onset marijuana use in adolescents is associated with significant clinical and psychosocial implications and distinct risky behaviors.