Is Cannabis Legalization Driving Youth Cannabis Use?

Minnesota’s latest student survey shows a substantial decline in reported youth cannabis use. That is encouraging, but it does not establish that legalization caused the decline or that legal retail markets have no effect on adolescents. Studies of cannabis policy produce different results depending on the population, period and outcome measured.

What the Minnesota Survey Found

In its April 20, 2026 report, the Minnesota Department of Health said past-year cannabis use among eighth, ninth and 11th graders combined fell from 14.9% in 2013 to 6.3% in 2025. That is an 8.6-percentage-point decline, or a 57.7% relative decrease.

The department also reported that 96% of students had not used cannabis in the preceding month. That monthly measure should not be confused with the separate past-year figures. More students perceived weekly cannabis use as moderately or greatly harmful, reversing an earlier decline in perceived risk.

The Minnesota Student Survey provides state, county and district results across several survey years. Its findings describe self-reported behavior among participating students; they are not a controlled test assigning communities to different cannabis policies.

Why Timing Matters

Minnesota allowed adult possession and use beginning August 1, 2023. The Department of Education scheduled the 2025 survey for January through June. Meanwhile, the Office of Cannabis Management issued its first state cannabis business license on June 18, 2025, to a cultivator.

Tribal dispensaries had already begun operating in 2023, but the broader state-licensed market developed later. The office’s retail expansion announcement explains that distinction. Therefore, the 2025 survey is an early post-legalization observation, not an assessment of many years of widespread state-licensed retail sales.

The decline also began well before the 2023 law. A simple comparison of 2013 and 2025 cannot isolate the effects of legalization from changes in schooling, social activity, prevention, the pandemic or other influences. Declining youth use over time and a policy’s effect relative to what would otherwise have happened are different questions.

What Other Studies Show

A 2024 JAMA Pediatrics study using state youth surveys through 2021 found no net increase in adolescent cannabis use associated with recreational legalization and retail sales. However, the authors also flagged greater use frequency among some existing users following retail availability. An unchanged overall prevalence can coexist with concerns about heavier consumption among those who already use cannabis.

A newer April 2026 JAMA Network Open study examined more than 1.3 million screening questionnaires from adolescents aged 13–17 in Kaiser Permanente Northern California between 2011 and 2024. These were questionnaires, not 1.3 million distinct adolescents. Reported past-year cannabis use increased following recreational legalization, then decreased after the COVID-19 pandemic, returning to prelegalization levels by 2024.

That study cannot automatically be generalized to all teenagers: it covered insured adolescents receiving care in one region, and its estimates depend on assumptions about time trends and other events. It nevertheless shows why a broad claim that legalization never increases adolescent use goes beyond the evidence.

Access Controls Are Plausible Explanations, Not Proven Causes

Age checks, education campaigns and changes in attitudes are possible mechanisms through which policy could influence behavior. But Minnesota’s reported decline does not demonstrate how much any one mechanism contributed. Claims that legalization removed a “forbidden fruit” appeal, or that education caused the change in risk perception, require evidence beyond the survey trend.

Useful follow-up research should separate law passage from retail opening, compare relevant populations, and examine frequency, high-potency products and routes of access as well as any use. The site’s cannabis research coverage can help readers follow those distinctions as new findings emerge.

What Families and Schools Can Do

Population trends do not remove the risks of cannabis use during adolescence. The CDC’s guidance for teens and parents discusses effects on attention, memory and learning, as well as cannabis use disorder and mental-health concerns. It encourages parents to discuss those risks and ask about their children’s experiences.

Keep conversations factual and open enough for a young person to ask for help. Schools can use their own survey results to identify concerns and guide prevention, while families can discuss avoiding impaired driving and seeking support when use begins affecting daily life.

What the Evidence Supports

Minnesota’s figures document a welcome decline among surveyed students. They do not settle whether legalization increases or decreases youth cannabis use in every setting. The strongest reading is to retain the positive finding, acknowledge the limits of the comparison, and continue evaluating adolescent outcomes as the legal market develops.