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Developing and Strengthening Cannabis Warnings: Warning Message Testing

StatusCompleted
PhaseNot applicable
Started
View on ClinicalTrials.gov ↗

Record History

  1. Completed without a posted recruiting period Final enrollment: 1750 participants (planned 1500) · Primary completion date changed from estimate of Nov 30, 2026 to Aug 27, 2026 · Start date changed from estimate of Jul 13, 2026 to Jul 31, 2026 · 3 more Show 6 more changesShow less
    • Final enrollment: 1750 participants (planned 1500)
    • Primary completion date changed from estimate of Nov 30, 2026 to Aug 27, 2026
    • Start date changed from estimate of Jul 13, 2026 to Jul 31, 2026
    • Secondary endpoints: details revised at 1 of 1 entry
    • Site contact updated
    • Eligibility criteria expanded, about 4 words
  2. Study First Submitted
  • Stopped: an ongoing trial was terminated, suspended or withdrawn.
  • Notable: the trial’s plan changed such as a big move in its timeline or size, a new primary endpoint, sponsor or phase, or recruiting opened or resumed.
  • Minor: routine progress and housekeeping, such as sites added or enrollment closed.
The purpose of this activity is to identify promising cannabis warning messages from different themes. Participants will be adults who live in the United States, including both people who use cannabis and those who do not use cannabis. In an online within-subjects experiment, participants will be randomly assigned to view 7 cannabis warning messages from different themes developed as part of previous study activities. After viewing each cannabis warning message, participants will rate the message on awareness, clarity, believability, cognitive elaboration, perceived message effectiveness, and reactance. The survey will take 15-20 minutes.
Trial Details
NCT Number NCT07699198
Lead Sponsor University of North Carolina, Chapel Hill
Collaborators: National Institute on Drug Abuse (NIDA)
Conditions Cannabis, Marijuana Use
Enrollment 1,750 participants
Start Date
Primary Completion (estimated)
Study Completion (estimated)
Updated on ClinicalTrials.gov