Developing and Strengthening Cannabis Warnings: Warning Message Testing
2 other identifiers
interventional
1,500
1 country
1
Brief Summary
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 Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P75+ for not_applicable
Started Jul 2026
Shorter than P25 for not_applicable
1 active site
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
June 25, 2026
CompletedFirst Posted
Study publicly available on registry
July 13, 2026
CompletedStudy Start
First participant enrolled
July 13, 2026
CompletedPrimary Completion
Last participant's last visit for primary outcome
November 30, 2026
ExpectedStudy Completion
Last participant's last visit for all outcomes
November 30, 2026
July 13, 2026
June 1, 2026
5 months
June 25, 2026
July 8, 2026
Conditions
Keywords
Outcome Measures
Primary Outcomes (1)
Cognitive Elaboration
A one item measure of cognitive elaboration to assess how much a message makes the participant think about the health risks of cannabis. Response options are on a 5-point scale from 5='A great deal' to 1= 'Not at all', with higher scores indicating higher cognitive elaboration.
Baseline (one time online survey)
Secondary Outcomes (1)
Perceived Message Effectiveness
Baseline (one time online survey)
Other Outcomes (3)
Clarity
Baseline (one time online survey)
Believability
Baseline (one time online survey)
Reactance
Baseline (one time online survey)
Study Arms (1)
Cannabis warning messages
EXPERIMENTALParticipants will view and rate 7 cannabis warning messages. The cannabis warning messages cover 11 different themes plus a control theme and were identified in a previous study activity. Theme 1: Constituents Theme 2: Cognitive Functioning Theme 3: Cardiovascular Health Theme 4: Motor Vehicle Crashes Theme 5: Dependence Theme 6: Psychosis and Schizophrenia Theme 7: Mental Health Theme 8: Reproductive Health Theme 9: Respiratory Health Theme 10: Edibles Theme 11: Cannabis Hyperemesis Syndrome Theme 12: Control
Interventions
Participants will view and rate a message about constituents.
Participants will view and rate a message about cognitive functioning.
Participants will view and rate a message about cardiovascular health.
Participants will view and rate a message about motor vehicle crashes.
Participants will view and rate a message about dependence.
Participants will view and rate a message about psychosis and schizophrenia.
Participants will view and rate a message about mental health.
Participants will view and rate a message about reproductive health.
Participants will view and rate a message about respiratory health.
Participants will view and rate a message about cannabis hyperemesis syndrome.
Eligibility Criteria
You may qualify if:
- Age 18 years of age and older
- Live in the United States
You may not qualify if:
- Age less than 18 years of age
- Does not live in the United States
Contact the study team to confirm eligibility.
Sponsors & Collaborators
Study Sites (1)
University of North Carolina at Chapel Hill
Chapel Hill, North Carolina, 27514, United States
MeSH Terms
Conditions
Interventions
Condition Hierarchy (Ancestors)
Intervention Hierarchy (Ancestors)
Study Officials
- PRINCIPAL INVESTIGATOR
Sarah D Kowitt, PhD, MPH
University of North Carolina, Chapel Hill
- PRINCIPAL INVESTIGATOR
Leah M Ranney, PhD, MA
University of North Carolina, Chapel Hill
Central Study Contacts
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- NA
- Masking
- NONE
- Purpose
- PREVENTION
- Intervention Model
- SINGLE GROUP
- Sponsor Type
- OTHER
- Responsible Party
- SPONSOR
Study Record Dates
First Submitted
June 25, 2026
First Posted
July 13, 2026
Study Start
July 13, 2026
Primary Completion (Estimated)
November 30, 2026
Study Completion (Estimated)
November 30, 2026
Last Updated
July 13, 2026
Record last verified: 2026-06
Data Sharing
- IPD Sharing
- Will share
- Shared Documents
- STUDY PROTOCOL, SAP
- Time Frame
- The dataset will be available after data collection and analysis and will remain available for 10 years
- Access Criteria
- Open Access
A de-identified version of individual participant data will be shared through the UNC Dataverse