Stanford launches massive trial of online cannabis prevention for teens

NCT ID NCT07357454

Not yet recruiting Prevention Sponsor: Stanford University Source: ClinicalTrials.gov ↗

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

Stanford University is testing a free online toolkit called Smart Talk to see if it can prevent cannabis use among middle and high school students. The study will enroll 10,800 students across participating schools. The curriculum includes lessons, quizzes, and activities to change attitudes about cannabis, build refusal skills, and improve coping. Researchers will measure changes in actual cannabis use and intentions to use.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Smart Talk Cannabis Awareness and Prevention curriculum (online educational toolkit)
What this could lead to: If it works, this could give schools a proven tool to reduce cannabis use and intentions among teens.
What could go wrong: This is a large but early-stage behavioral study. Results depend on how well schools implement the curriculum, and actual behavior change is hard to measure.

This is an AI summary of the original study and may miss details. Read our disclaimer.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

CANNABIS USE

Contacts and locations

Locations

Stanford University

Palo Alto, California, 94304, United States

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