Cannabis UseNCT07524985
Joint Effort 2.0 : Evaluation Among General Population
A study testing Joint Effort and Brief normative feedback and standard information in people with Cannabis Use, run by Centre hospitalier de l'Université de Montréal (CHUM) at 1 site in Canada.
Trial summary
This study aims to evaluate a mobile app designed to promote the safe use of cannabis among adult users in Quebec. Read more about this study
- Who is it for?
- Ages 18 years and olderHealthy volunteers can take part
- Conditions the study is for
- Cannabis Use
- What is being tested?
- Joint Effort and Brief normative feedback and standard information
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 110 participants
- Where
- 1 siteCanada
- Study dates
- 30 Apr 2026to Apr 2027
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Aged 18 years old or older
- Be an active non-medical cannabis user (ie. self reported past month usage)
- Understand, read and write French
- Own a smartphone (iPhone)
Who cannot join
- None
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Canada1 site, 1 recruiting
- Recruiting
Université de Montréal
Montreal, Quebec
José Côté, 514-890-8000, jose.cote@umontreal.ca
About this study
Official title: " Joint Effort 2.0 " Une Application Mobile de prévention et de réduction Des méfaits: évaluation auprès de Consommateurs de Cannabis
This study aims to evaluate a mobile app designed to promote the safe use of cannabis among adult users in Quebec.
- Conditions
- Cannabis Use
- Being tested
- Joint Effort, Brief normative feedback and standard information
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Joint EffortOther
The Joint Effort intervention is available as an iPhone mobile application in French language. It aims to support cannabis users to take action upon their cannabis use.
Brief normative feedback and standard informationOther
The brief normative feedback is based on the frequency of cannabis use. Participants will also be offered basic reliable non-personalized information on lower-risk cannabis use in the form of official public websites.
| Study group | Role | What they receive |
|---|---|---|
| Joint Effort | Experimental | Mobile application Receives: Other: Joint Effort |
| Brief normative feedback and standard information | Active comparator | Webpage Receives: Other: Brief normative feedback and standard information |
What is being measured
The primary outcome is the main question the study is designed to answer.
Protective Behavioral Strategies for Marijuana
Adoption of Protective Behavioral Strategies; measured with the Protective Behavioral Strategies for Marijuana scale (PBSM-17).
The French version of the questionnaire translated by Côté et al. (2021) will be used. The 17 items each represent a behavioral protection strategy. They are measured in terms of frequency of use on a six-point Likert-type scale (never, rarely, occasionally, sometimes, often and always).
The total score of the PBSM-17 is obtained by calculating the total score of each item and then converting this raw score into a standardized form (T-score) ranging from 15 to 73. The lower the total score, the lesser the use of PBS.
Measured: Baseline, 2-weeks, 4-weeks
Secondary outcomes (3)
Intention to take action
Intention to take action on cannabis use is assessed via a three-item French-language questionnaire developed for this study, based on Ajzen's guidelines for measuring Theory of Planned Behavior.
The questionnaire consist of 3 items: 1) "I intend to take action on my cannabis use in the coming month"; 2) "In the coming month, the chances that I will take action on my cannabis use are…"; and 3) "In the coming month, I will take action on my cannabis use." The items are rated on a seven-point Likert scale ranging, respectively, from "strongly disagree" to "strongly agree", "very low" to "very high", and "very unlikely" to "very likely".
The score of intention to change is the sum of the 3 items (possible score range: 3 to 21). The lower the total score, the weaker the intention to take action on CU.
Measured: Baseline, 2-weeks, 4-weeks
Cannabis use frequency
Cannabis use frequency is measured by a question adapted from the French version of the Canadian Community Health Survey (CCHS) : "How often did you use cannabis in the past month?".
The answers follows a six-category rating scale: never; one day in the past month; 2-3 days in the past month; 1-2 days per week in the past month; 3-4 days per week in the past month; 5-6 days per week in the past month; and every day.
Measured: Baseline, 4-weeks
Severity of Dependence
Level of dependence is measured with the Severity of Dependence Scale (french version).
It consists of five items covering different psychological aspects of dependence: feeling of impaired control, anxiety, preoccupations, wish to stop, and compulsive use.
The possible score ranges from 0 to 15. Items 1 to 4 are scored as follows: 0 = never/almost never, 1 = sometimes, 2 = often, and 3 = always/nearly always. Item 5 is scored as follows: 0 = not difficult, 1 = quite difficult, 2 = very difficult, and 3 = impossible.
Previous studies have set empirically derived optimal cut-off scores for cannabis dependence at 2 to 4 or greater.
Measured: Baseline
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted13 Apr 2026
- Study start30 Apr 2026
- Primary completionApr 2027 (estimated)
- Study completionApr 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Cannabis UseStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 110 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Centre hospitalier de l'Université de Montréal (CHUM)
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Didier Jutras-Aswad, Principal investigator, Université de MontréalSylvie Cossette, Principal investigator, Université de MontréalChristine Genest, Principal investigator, Université de MontréalShalini Lal, Principal investigator, Université de MontréalJudith Lapierre, Principal investigator, Laval UniversityGabrielle Pagé, Principal investigator, Université de MontréalJinghui Cheng, Principal investigator, Polytechnique Montréal
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07524985
- Sponsor's protocol ID
- 2026-13232
- Status last verified
- Jun 2026
- First submitted
- 2 Apr 2026
- Last updated
- 3 Jun 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 3 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- " Joint Effort 2.0 " Une Application Mobile de prévention et de réduction Des méfaits: évaluation auprès de Consommateurs de Cannabis
- ClinicalTrials.gov ID
- NCT07524985
- Acronym / sponsor ID
- 2026-13232
- Conditions
- Cannabis Use
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 110 participants (estimated)
- Lead sponsor
- Centre hospitalier de l'Université de Montréal (CHUM)University, hospital or other
- Study start
- 30 Apr 2026 (actual)
- Primary completion
- Apr 2027 (estimated)
- Study completion
- Apr 2027 (estimated)
- First posted
- 13 Apr 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study aims to evaluate a mobile app designed to promote the safe use of cannabis among adult users in Quebec.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Joint Effort | Experimental | Other: Joint EffortMobile application |
| Brief normative feedback and standard information | Active comparator | Other: Brief normative feedback and standard informationWebpage |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Aged 18 years old or older
- Be an active non-medical cannabis user (ie. self reported past month usage)
- Understand, read and write French
- Own a smartphone (iPhone)
Key exclusion criteria (1 listed)
- None
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Joint EffortThe Joint Effort intervention is available as an iPhone mobile application in French language. It aims to support cannabis users to take action upon their cannabis use. | Other | Joint Effort |
| Brief normative feedback and standard informationThe brief normative feedback is based on the frequency of cannabis use. Participants will also be offered basic reliable non-personalized information on lower-risk cannabis use in the form of official public websites. | Other | Brief normative feedback and standard information |
Primary outcome
Protective Behavioral Strategies for Marijuana
Time frame: Baseline, 2-weeks, 4-weeks
Adoption of Protective Behavioral Strategies; measured with the Protective Behavioral Strategies for Marijuana scale (PBSM-17). The French version of the questionnaire translated by Côté et al. (2021) will be used. The 17 items each represent a behavioral protection strategy. They are measured in terms of frequency of use on a six-point Likert-type scale (never, rarely, occasionally, sometimes, often and always). The total score of the PBSM-17 is obtained by calculating the total score of each item and then converting this raw score into a standardized form (T-score) ranging from 15 to 73. The lower the total score, the lesser the use of PBS.
3 secondary outcomes
Intention to take action
Time frame: Baseline, 2-weeks, 4-weeks
Cannabis use frequency
Time frame: Baseline, 4-weeks
Severity of Dependence
Time frame: Baseline
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 3 Jun 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Didier Jutras-Aswad principal investigator
Université de Montréal
Sylvie Cossette principal investigator
Université de Montréal
Christine Genest principal investigator
Université de Montréal
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Joint Effort and Brief normative feedback and standard information in people with Cannabis Use, run by Centre hospitalier de l'Université de Montréal (CHUM) at 1 site in Canada.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 3 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Canada. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact José Côté, PhD (514-890-8000, jose.cote@umontreal.ca), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Protective Behavioral Strategies for Marijuana (time frame: Baseline, 2-weeks, 4-weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 3 Jun 2026.