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A 5-session toolkit aims to curb teen cannabis use — will it work?

NCT ID NCT05521321

Prevention Sponsor: Stanford University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jul 28, 2026 · Last updated Jul 29, 2026 · Updated 1 time

Summary

This trial tests a school-based curriculum called Smart Talk, designed to reduce cannabis use and intentions among middle and high school students. Over five lessons, the program targets misperceptions, refusal skills, stress, and coping. Researchers will measure whether students' cannabis use and future intentions change after the program.

What this could mean

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

Active substance
Stanford Smart Talk Cannabis Awareness and Prevention curriculum
What this could lead to
If effective, this toolkit could provide schools with a simple, evidence-based way to reduce cannabis use and risky intentions among adolescents.
What could go wrong
This is a feasibility study, not a large-scale efficacy trial. The curriculum may not change actual behavior, and results may not generalize beyond the participating schools.

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

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

658 people

The number who actually took part.

Started

Oct 2022

Finished

May 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

10 to 20 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Middle school and high school students receiving health education at schools participating in the study Exclusion Criteria: \-

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Conditions

The condition(s) this trial relates to.

cannabis dependence

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

More trials for these conditions

Other studies related to the condition(s) this trial covers.