Cannabis legalization, teen use trends, and what works in drug education | Research

The takeaway

Despite expanded legal access to cannabis across U.S. states, national survey data show mixed trends in adolescent use, and fear-based "Reefer Madness" education approaches have given way to evidence-based prevention strategies.

Educators, parents, and policymakers interested in adolescent cannabis use and prevention.

36 states with medical cannabis laws, 17 with recreational by 2021

What the researchers found

As of June 2021, 36 states had medical cannabis laws and 17 had recreational laws. Review of CDC YRBS, Monitoring the Future, and National Household Survey data showed that increased legal access has not consistently led to increased adolescent use, though cannabis can interfere with adolescent brain development.

Why it matters

Understanding whether legalization increases teen cannabis use is critical for public health policy. The review suggests the relationship is more complex than assumed.

The numbers in context

36 states with medical cannabis laws, 17 with recreational laws, plus territories and DC as of June 2021.

How the study worked

Review article synthesizing national survey data (YRBS, Monitoring the Future, NHSDUH) on adolescent cannabis use trends alongside evidence on legalization's impact, with discussion of prevention program strategies.

What this study cannot tell us

Review article without systematic methodology. National surveys may not capture regional variation. Self-reported adolescent use data may underestimate actual prevalence.

How to read the evidence

Non-systematic review drawing on multiple national survey datasets. Provides useful overview but lacks rigorous synthesis methodology.

When this study was published

Published in 2022 with data through 2021.

The bigger picture

The shift from fear-based to evidence-based cannabis education reflects broader changes in how public health approaches substance use prevention among young people.

Questions still open

Which prevention program components are most effective for cannabis specifically? How do changing potency levels affect the risk-benefit calculation for adolescent education?

Common questions

Has legalization led to more teens using cannabis?

Not consistently. National survey data reviewed in this study show mixed trends, with some metrics showing stable or declining adolescent use even as legal access expanded.

What kind of drug education works for today's teens?

The review finds that evidence-based prevention programs focusing on skills building and accurate information are more effective than fear-based "Reefer Madness" approaches, which no longer resonate with young people.

Read the original research

Public Health Implications of Cannabis Legalization: An Exploration of Adolescent Use and Evidence-Based Interventions.

International journal of environmental research and public health, 19(6)

View on PubMed ↗Publisher’s paper ↗

Citation

Donnelly, Joseph; Young, Michael; Marshall, Brenda; Hecht, Michael L; Saldutti, Elena. (2022). Public Health Implications of Cannabis Legalization: An Exploration of Adolescent Use and Evidence-Based Interventions.. International journal of environmental research and public health, 19(6). https://doi.org/10.3390/ijerph19063336