Which cannabis warnings stick? study puts messages to the test
NCT ID NCT07699198
First seen Jul 13, 2026 · Last updated Jul 14, 2026 · Updated 1 time
Summary
This study aims to find out which cannabis warning messages are most effective at raising awareness and changing perceptions. Researchers will show US adults (both users and non-users) seven different warning messages covering topics like dependence, cognitive function, and cardiovascular health. Participants will rate each message on clarity, believability, and how much it makes them think about cannabis risks. The results could guide future public health campaigns.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this research could help identify the most effective warning messages to inform the public about cannabis risks.
- What could go wrong
- This is a brief online survey, not a real-world intervention. Results may not predict how warnings actually change behavior.
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
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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
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About 1,500 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jul 2026
An estimate. Start dates often move.
- Expected to finish
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Nov 2026
An estimate. End dates often move.
- Lead sponsor
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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
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: * Age 18 years of age and older * Live in the United States Exclusion Criteria: * Age less than 18 years of age * Does not live in the United States
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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University of North Carolina at Chapel Hill
Chapel Hill, North Carolina, 27514, United States
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