|Titre :||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 (2019)|
|Auteurs :||K. M. KEYES ; C. RUTHERFORD ; R. MIECH|
|Type de document :||Article : Périodique|
|Dans :||Drug and Alcohol Dependence (Vol.194, January 2019)|
|Article en page(s) :||51-58|
|Discipline :||EPI (Epidémiologie / Epidemiology)|
Thésaurus TOXIBASEADOLESCENT ; EVOLUTION ; ETUDE TRANSVERSALE ; TABAC ; ALCOOL ; CANNABIS ; THEORIE DE L'ESCALADE ; INITIATION
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 beta=0.04, SE = 0.001, p 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.
Grade of first use of alcohol/cigarettes increasing, onset of marijuana use stable.
Majority of adolescent use marijuana in a grade prior to or same as cigarettes.
Marijuana displaces alcohol/cigarettes as 1st substance among users of >1 substance.
|Domaine :||Alcool / Alcohol ; Drogues illicites / Illicit drugs ; Tabac / Tobacco|
|Affiliation :||Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY, USA|