Constituents
Participants will view and rate a message about constituents.
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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.
Locally preserved from ClinicalTrials.govOpen ClinicalTrials.govlast source update 2026-07-13
What this record can show
This locally preserved record separates the registered protocol from source-reported registry results. Neither is a treatment recommendation.
Registry facts
The purpose of this activity is to identify promising cannabis warning messages from different themes. Setting: An online survey of adults who live in the United States. Participants: An estimated N=1500 adults who live in the United States, including both people who use cannabis and those who do not use cannabis. Participants will be recruited by Qualtrics Services. Participants who are eligible for the study will view a consent form as part of the survey and check a box to indicate that they agree to participate in the study. Once the participant has completed consent, they will be able to begin the survey. Procedures: Participants will complete a within-subjects experiment in which they view and rate cannabis warning messages from different themes. Participants will be screened for inclusion and answer questions on demographic information and susceptibility to cannabis use. Participants will then 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. There will be a total of 11 warning themes plus control. After viewing and rating their assigned cannabis warning messages, participants will answer additional questions about cannabis risk perceptions and use behavior (if applicable), additional demographic information, and about their use of tobacco and alcohol. The survey will take 15-20 minutes.
Linked local records
Local links use governed condition terms or exact source-reported intervention names. They are navigation candidates, not efficacy claims.
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 edibles.
Participants will view and rate a message about cannabis hyperemesis syndrome.
Participants will view and rate a control message.
Eligibility
primary outcomes
Time frame: Baseline (one time online survey)
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.
secondary outcomes
Time frame: Baseline (one time online survey)
This survey item assesses perceived message effectiveness in terms of how concerned the message makes the participant feel about the health effects of using cannabis. Response options are on a 5-point scale from 5='A great deal' to 1='Not at all' with higher scores indicating higher perceived message effectiveness.
other outcomes
Time frame: Baseline (one time online survey)
This survey item assesses the extent to which a participant feels that the message is clear. Response options are on a 5-point scale from 5='Very clear' to 1='Not clear at all' with higher scores indicating that a message is more clear.
Time frame: Baseline (one time online survey)
This survey item assesses the extent to which a participant feels that the message is believable. Response options are on a 5-point scale from 5='Very believable' to 1='Not at all believable' with higher scores indicating that a message is more believable.
Time frame: Baseline (one time online survey)
This survey item assesses reactance in terms of how much a participant is annoyed by the message. Response options are on a 5-point scale from 5='A great deal' to 1='Not at all' with higher scores indicating higher reactance to the message.
Publications
No exact PMID-linked public article is currently readable locally.