Cannabis use disorder in teens: What parents can do in 2026

Marijuana today is not the marijuana of previous generations. Average THC concentrations have increased from 4% in the 1990s to 25%+ in many current products, with concentrates reaching 90%. Adolescent brains — still developing until approximately age 25 — are particularly vulnerable to the effects of high-potency cannabis, and cannabis use disorder in teens is rising alongside potency.

Why teens are more vulnerable

The adolescent brain is in a critical period of development — specifically in areas governing executive function, decision-making, impulse control, and emotional regulation. Regular cannabis use during this window is associated with lasting impacts on cognitive development (IQ reductions of up to 8 points in heavy adolescent users), increased risk of psychotic disorders (particularly in teens with genetic predisposition), higher rates of anxiety and depression, reduced academic achievement, and increased risk of lifelong addiction (17% of those who begin using in adolescence develop cannabis use disorder).

Signs your teen may have a problem

Declining grades or lost interest in activities they previously enjoyed. Red or bloodshot eyes, frequent use of eye drops. Increased appetite or unexplained weight gain. New friend group, particularly friends you have not met. Defensive or angry reactions when marijuana is mentioned. Paraphernalia: pipes, papers, vaporizer cartridges, edible packaging. Withdrawal symptoms when unable to use: irritability, insomnia, decreased appetite.

What parents can do

Have honest conversations about potency increases (this is genuinely more dangerous than what you may have used in your youth). Set clear expectations and consequences, but lead with curiosity rather than punishment. If your teen is already using regularly, punishment alone is unlikely to work — they may need professional assessment. Ask your pediatrician for a CRAFFT screening (the standard adolescent substance use screening tool). If dependence is present, outpatient treatment with a therapist experienced in adolescent substance use is the typical starting point. Family therapy that improves communication and addresses underlying issues is often more effective than individual therapy alone.

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Authoritative sources

This article references guidelines from: NIH · NAMI · APA · Harvard Health · Mayo Clinic

Frequently asked questions

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.