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Related Experiment Videos

Types of marijuana users by longitudinal course.

D B Kandel1, K Chen

  • 1New York State Psychiatric Institute, New York 10031, USA.

Journal of Studies on Alcohol
|May 12, 2000
PubMed
Summary

This study identified four distinct marijuana user groups based on onset and usage patterns. Early marijuana initiation does not always lead to heavy use or progression to other drugs.

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Area of Science:

  • Psychology
  • Addiction Science
  • Developmental Psychology

Background:

  • Alcoholism and antisocial behavior taxonomies often use two-group classifications based on developmental course.
  • Typologies for illicit drug users are less developed, necessitating a specific taxonomy for marijuana users.

Purpose of the Study:

  • To propose and validate a developmental taxonomy of marijuana users.
  • To classify marijuana users based on age of onset, chronicity, and persistence of use.

Main Methods:

  • Cluster analysis of a community sample of 708 marijuana users followed from adolescence to age 34-35.
  • Utilized Ward method with relocation, ANOVA, and logit analyses to define and describe user clusters.

Main Results:

  • Identified four marijuana user clusters: early onset-heavy use, early onset-light use, mid onset-heavy use, and late onset-light use.
  • Groups differed in marijuana/other drug involvement, sociodemographics, and lifestyle.
  • Early onset did not predominantly lead to heavy marijuana use; peer delinquency and mental health were factors in heavy use development.

Conclusions:

  • A two-type classification is insufficient for understanding marijuana user heterogeneity.
  • Early marijuana onset alone does not predict problematic use or polydrug use.
  • Motivation for use and dysfunctional behaviors are key to developing problematic drug use and dependence.

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