As marijuana becomes more widely available and socially accepted, many teens and families assume it is harmless. However, a growing body of research suggests that marijuana use during adolescence may be linked to negative outcomes in both school performance and mental health.
A large review of 63 studies involving nearly 440,000 young people found that marijuana use during adolescence was associated with lower grades, increased absenteeism, higher dropout rates, and lower rates of high school and college completion. Researchers also noted that today’s marijuana products contain significantly higher levels of THC than those available decades ago.
Research is also raising concerns about marijuana’s impact on mental health. A recent study found that individuals who used both marijuana and tobacco were nearly three times more likely to develop psychosis than individuals who used neither substance. Researchers also observed higher rates of psychiatric symptoms among co-users.
Growing concerns about the relationship between marijuana and serious mental illness have led researchers, healthcare providers, and policymakers to call for greater awareness of potential risks. Mental health professionals point to increasing evidence linking heavy marijuana use, especially among adolescents and young adults, to psychosis and other psychiatric conditions in vulnerable individuals.
While not every teen who uses marijuana will experience these outcomes, experts emphasize that adolescence is a critical period of brain development. Decisions made during these years can affect learning, memory, attention, emotional regulation, decision-making, and overall wellbeing.
These findings are important not only for marijuana prevention but for substance use prevention more broadly. Research consistently shows that early substance use can increase vulnerability to future substance-related problems, making prevention efforts during adolescence especially important. Helping youth develop healthy coping skills, strong family relationships, and informed decision-making can reduce risks associated with a variety of substances, including marijuana, alcohol, nicotine, and opioids.
Parents and caregivers play a critical role in prevention. Open communication, clear family expectations, and ongoing conversations about substance use can help young people make healthier choices. Safe storage is another important prevention tool. Marijuana products, prescription medications, alcohol, and other substances should be stored securely and out of reach of youth. Unused medications should be disposed of through authorized drop boxes or medication take-back events.
As communities continue to address substance use and overdose challenges, prevention remains one of the most effective strategies. Educating families about emerging research, promoting healthy youth development, and reducing access to substances can help prevent future substance misuse and support long-term health and wellbeing.
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