Historical trends in the grade of onset and sequence of cigarette, alcohol, and marijuana use among adolescents from 1976-2016: Implications for "Gateway" patterns in adolescence

Drug Alcohol Depend. 2019 Jan 1;194:51-58. doi: 10.1016/j.drugalcdep.2018.09.015. Epub 2018 Oct 24.

Abstract

Introduction: In the past decade, marijuana use prevalence among adolescents has remained relatively steady while cigarette and alcohol prevalence has declined. We examined historical trends in: average grade of onset of marijuana, alcohol, and cigarette use by 12th grade; proportion who try alcohol/cigarettes before first marijuana use, among those who use by 12th grade; and conditional probability of marijuana use by 12th grade after trying alcohol/cigarettes.

Methods: Data were drawn from 40 yearly, cross-sectional surveys of 12th grade US adolescents. A subset of students (N = 246,050) were asked when they first used each substance. We reconstructed cohorts of substance use from grade-of-onset to determine sequence of drug use, as well as probability of marijuana use in the same or later grade.

Results: Average grade of first alcohol and cigarette use by 12th grade increased across time; e.g., first cigarette increased from grade 7.9 in 1986 to 9.0 by 2016 (β=0.04, SE = 0.001, p < 0.01). The proportion of 12th grade adolescents who smoke cigarettes before marijuana fell below 50% in 2006. Each one-year increase was associated with 1.11 times increased odds of first cigarette in a grade after first marijuana (95% C.I. 1.11-1.12). Among those who initiate alcohol/cigarettes prior to marijuana by 12th grade, the probability of subsequent marijuana use is increasing.

Conclusion: Marijuana is increasingly the first substance in the sequence of adolescent drug use. Reducing adolescent smoking has been a remarkable achievement of the past 20 years; those who continue to smoke are at higher risk for progression to marijuana use.

Keywords: Adolescent; Alcohol; Gateway; Marijuana; Monitoring the Future; Tobacco.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Adolescent
  • Adolescent Behavior* / psychology
  • Alcohol Drinking / epidemiology
  • Alcohol Drinking / psychology
  • Alcohol Drinking / trends*
  • Cigarette Smoking / epidemiology
  • Cigarette Smoking / psychology
  • Cigarette Smoking / trends*
  • Cross-Sectional Studies
  • Female
  • Humans
  • Male
  • Marijuana Use / epidemiology
  • Marijuana Use / psychology
  • Marijuana Use / trends*
  • Prevalence
  • Students / psychology
  • Substance-Related Disorders / diagnosis
  • Substance-Related Disorders / epidemiology
  • Substance-Related Disorders / psychology