ArticlePreventive medicine reports2021
Trends in youth cannabis use across cannabis legalization: Data from the COMPASS prospective cohort study.
Article in Preventive medicine reports, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
30 citing papers in PubMed.
- The role of perceived access to cannabis in the association between friends who use cannabis and adolescent initiation: A longitudinal analysis from the Canadian COMPASS study.Addiction (Abingdon, England) · 2026Observational
- Independent brain cortical signatures of risk for adolescent cannabis use and consequences of such use are moderated by sex.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2026Article
- Using decision trees to examine risk profiles for cannabis use among large samples of underage youth before and after cannabis legalization in Canada.Addictive behaviors reports · 2025Article
- Exploring cannabis consumption stigma in Canada with consideration of age and gender differences.Addictive behaviors reports · 2025Article
- Legalizing Youth-Friendly Cannabis Edibles and Extracts and Adolescent Cannabis Use.JAMA network open · 2025Article
- Reconceptualizing cannabis use risks in the context of health and social inequities: Insights from a qualitative study with young people in Canada.The International journal on drug policy · 2025Article
- Post-legalization shifts in cannabis use among young adults in Georgia-A nationally representative study.Addiction (Abingdon, England) · 2025Article
- Changes in cannabis use post decriminalisation in mental health care users in South Africa.The South African journal of psychiatry : SAJP : the journal of the Society of Psychiatrists of South Africa · 2025Article
- Reducing the harms of cannabis use in youth post-legalization: insights from Ontario youth, parents, and service providers.Harm reduction journal · 2024Article
- Understanding youth and young adult cannabis use in Canada post-legalization: a scoping review on a public health issue.Substance abuse treatment, prevention, and policy · 2024Article
- Rewiring the future: drugs abused in adolescence may predispose to mental illness in adult life by altering dopamine axon growth.Journal of neural transmission (Vienna, Austria : 1996) · 2024Review
- Cannabis use among hospitalised adolescents before and after decriminalisation in South Africa.The South African journal of psychiatry : SAJP : the journal of the Society of Psychiatrists of South Africa · 2024Article
- Impact of Legalization on Cannabis Use, Attitudes, and Purchasing Preferences: A Repeated Cross-Sectional Survey of Canadian Young Adults.Cannabis (Albuquerque, N.M.) · 2024Article
- Youth perception of difficulty accessing cannabis following cannabis legalization and during the early and ongoing stages of the COVID-19 pandemic: repeat cross-sectional and longitudinal data from the COMPASS study.Archives of public health = Archives belges de sante publique · 2023Article
- Proteome-Wide Profiling Using Sample Multiplexing of a Human Cell Line Treated with Cannabidiol (CBD) and Tetrahydrocannabinol (THC).Proteomes · 2023Article
- Canadian cannabis education resources to support youth health literacy: A scoping review and environmental scan.Health education journal · 2023Article
- Factors associated with cannabis use in early adolescence.Health promotion and chronic disease prevention in Canada : research, policy and practice · 2023Article
- Youth cannabis use in Canada post-legalization: service providers' perceptions, practices, and recommendations.Substance abuse treatment, prevention, and policy · 2023Article
- Trends of cannabis use and related harms before and after legalization for recreational purpose in a developing country in Asia.BMC public health · 2023Article
- Effects of Cannabis Legalization on Adolescent Cannabis Use Across 3 Studies.American journal of preventive medicine · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Canada legalized recreational cannabis use for adults on October 17, 2018 with decision-makers emphasising the need to reduce cannabis use among youth. We sought to characterise trends of youth cannabis use before and after cannabis legalization by relying on a quasi-experimental design evaluating cannabis use among high school students in Alberta, British Columbia, Ontario, and Québec who participated in the COMPASS prospective cohort study. Overall trends in use were examined using a large repeat cross-sectional sample (n = 102,685) at two time points before legalization (16/17 and 17/18 school years) and one after (18/19 school year). Further differential changes in use among students affected by legalization were examined using three sequential four-year longitudinal cohorts (n = 5,400) of students as they progressed through high school. Youth cannabis use remains common with ever-use increasing from 30.5% in 2016/17 to 32.4% in 2018/19. In the repeat cross-sectional sample, the odds of ever use in the year following legalization were 1.05 times those of the preceding year (p = 0.0090). In the longitudinal sample, no significant differences in trends of cannabis use over time were found between cohorts for any of the three use frequency metrics. Therefore, it appears that cannabis legalization has not yet been followed by pronounced changes on youth cannabis use. High prevalence of youth cannabis use in this sample remains a concern. These data suggest that the Cannabis Act has not yet led to the reduction in youth cannabis use envisioned in its public health approach.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.