Mobile Application-Based Interventions for Cannabis Use in Young Adults With First Episode Psychosis

NCT07811466 | Not Yet Recruiting

• 1 other identifier: MP-02-2026-13381
• Study Type: interventional
• Target: 550
• Locations: 0 countries
• Sites: N/A

Brief Summary

Psychotic disorders affect approximately 4% of Canadians and have a significant impact on individuals' well-being, their families and social networks, and healthcare systems. The development of psychosis is explained by a complex interplay of genetic and environmental factors, including the use of psychoactive substances. Frequent cannabis use can contribute to the development of psychotic disorders. The prevalence of cannabis use disorder (CUD) in individuals with a first-episode psychosis (FEP) followed in Early Intervention Services (EIS) is 42-53%, well above that of the general population (\~3%). Cannabis use in individuals with psychosis is associated with increased symptom severity, higher rates of relapse and hospitalization, and poor psychosocial functioning. Standardized mobile app-based interventions offer a scalable and accessible solution. Our team developed and piloted CHAMPS (harm reduction) and iCanChange (use reduction/cessation) with favourable results: retention 82% (CHAMPS) and 84-86% (iCC), high satisfaction, and preliminary efficacy signals. The two pilot studies were targeting feasibility, this study is studying efficacy of the two app-based interventions (CHAMPS and iCanChange).

Conditions

First Episode Psychosis (FEP); Psychosis; Schizophreni-form Disorder; Dependence Addictive

Keywords

Adults 18-35 years old who had a first episode psychosis and are using cannabis

Outcome Measures

Primary Outcomes (2)

• CHAMPS Primary Outcome Measure

  To determine whether adding CHAMPS (an intervention aimed at developing safer consumption behaviors) to standard EIS is superior to standard EIS alone in reducing cannabis-related problems in young adults with FEP who are not seeking to cease or reduce their use. Total score of the Marijuana Problems Scale (MPS, 19 items, 0-38) at Week 8 post-randomization (also assessed at Week 12 post-randomization). Minimum clinically important difference (MCID): 2 points. For each MPS item, the participant rates a cannabis-related problem over the past month on a three-point scale: 0 = not a problem, 1 = a minor problem, 2 = a serious problem. Total scores range from 0 to 38; higher scores indicate more serious problems.

  Week 8 post randomization

• I Can Change Primary Outcome Measure

  To determine whether adding iCC to standard services offered in EIS clinics is superior to standard EIS alone in reducing the frequency of cannabis use in individuals with FEP and CUD (moderate to severe) who are seeking to reduce or cease their use. Number of days of cannabis use in the past 14 days (Timeline Follow Back, TLFB) at Week 12 (also assessed at Weeks 6 and 24 post-randomization).

  Week 12 post randomization

Secondary Outcomes (8)

• CHAMPS secondary Outcome Measure

  week 0-8-12

• CHAMPS secondary Outcome Measure

  week 0-8-12

• CHAMPS secondary Outcome Measure

  week 0-8-12

• CHAMPS secondary Outcome Measure

  week 0-8-12

• I Can Change Secondary Outcome Measure

  Week 0-6-12-24

Study Arms (4)

CHAMPS - intervention group

EXPERIMENTAL

Participants who receive the CHAMPS intervention

Other: CHAMPS

CHAMPS - no intervention group

NO INTERVENTION

Participants who are not receiving the CHAMPS intervention and are compared to the one who do

I Can Change - Intervention group

EXPERIMENTAL

Participants who receive the I Can Change intervention

Other: I Can Change

I Can Change - No intervention group

NO INTERVENTION

Participants who are not receiving the I Can Change intervention and are compared to the one who do

Interventions

CHAMPS OTHER

CHAMPS is a psychosocial e-intervention grounded in motivational interviewing (MI) and harm reduction principles, developed using the Behavioral Change Wheel (BCW) theoretical framework. CHAMPS is delivered through a mobile health platform and comprises 6 sequential psychotherapeutic modules (5-15 minutes each) plus a booster session: Module 1: Automatic personalized feedback on current cannabis PBS based on baseline assessment, with improvement suggestions and identification of strengths that facilitate change. Module 2: Exploration of personal values and the potential benefits of safer cannabis use practices Module 3: Evidence-based cannabis PBS using interactive psychoeducational techniques Module 4: Goal-setting using the SMART technique; participants define their own realistic cannabis-focused goals Module 5: Review of goal progress; support to revise current goal or adopt new consumption habits Module 6: Reassessment of consumption habits (PBS)

CHAMPS - intervention group

I Can Change OTHER

iCanChange (iCC) is a mobile app-based psychological intervention that incorporates principles of CBT, MI, and psychoeducation. It is available on Android and iPhone, in both English and French. Section 1 (10 modules): Modules 1 to 9 address topics such as cannabis dependence, myths, and its effects on psychosis, while helping users identify personal triggers, strengths, and benefits of reducing use. Section 1 concludes with Module 10, in which participants self-identify a flexible, person-oriented cannabis use goal such as reducing or stopping use. Two weeks after Module 10, an additional module is offered (up to two times) to consolidate and review goals. Section 2 (8 modules): Modules aim at increasing coping skills, equipping users with practical tools to maintain progress, planning cannabis-free activities, building social support, managing stress, and adopting a healthy lifestyle. Booster modules (3 sessions, one per month during the 12-week follow-up)

I Can Change - Intervention group

Eligibility Criteria

• Age: 18 Years - 35 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64)

You may qualify if:

• CHAMPS INTERVENTION
• Young adults (18-35 years) with FEP
• Cannabis use ≥1 day in the past month
• MPS score ≥2,
• NOT seeking treatment for cannabis use disorder (CUD).
• CUD diagnosis possible but not required.
• With a minimum of 2 months of follow-up at an EIS clinic.
• I CAN CHANGE INTERVENTION
• Young adults (18-35 years) with FEP and CUD (DSM-5, moderate to severe)
• Seeking to reduce or cease use
• With a minimum of 2 months of follow-up at an EIS clinic.

You may not qualify if:

• Pregnancy, breastfeeding, or any medical condition that, in the opinion of the psychiatrist, precludes safe participation or the ability to provide informed consent,
• Any disabling, unstable, or acute mental condition that, in the opinion of the psychiatrist, precludes safe participation or the ability to provide informed consent,
• Any planned extended absence (pending legal action, surgery, inpatient program) or other reason that, in the opinion of the study team, might prevent completion of the study,
• Presence of a substance use disorder that, in the opinion of the psychiatrist, precludes safe participation (e.g., very unstable or severe SUD),
• Currently participating in another specific cannabis use-focused intervention.

Sponsors & Collaborators

• Centre hospitalier de l'Université de Montréal (CHUM): lead
• Integrated University Health and Social Services Center of the Capitale-Nationale: collaborator
• Nova Scotia Health Authority: collaborator
• Centre Intégré de Santé et de Services Sociaux de la Montérégie-Centre: collaborator
• Centre Integre Universitaire de Sante et Services Sociaux du Nord de l'ile de Montreal: collaborator
• Ottawa Hospital Research Institute: collaborator

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MeSH Terms

Conditions

Psychotic Disorders; Behavior, Addictive

Condition Hierarchy (Ancestors)

Schizophrenia Spectrum and Other Psychotic Disorders; Mental Disorders; Compulsive Behavior; Impulsive Behavior; Behavior

Study Officials

• Didier Jutras-Aswad, MD

  Centre hospitalier de l'Université de Montréal (CHUM)

  PRINCIPAL INVESTIGATOR

Central Study Contacts

Catherine Provost, LL. M.

CONTACT

514-890-800-; catherine.provost.chum@ssss.gouv.qc.ca

Pamela Lachance-Touchette, PhD

CONTACT

514-890-8000; pamela.lachance-touchette.chum@ssss.gouv.qc.ca

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: SUPPORTIVE CARE
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Model Details: The app-based interventions are added to the services offered in EIS. Participants will be randomized in the intervention group (with the app-based intervention in addition to the regular follow-up in EIS clinic) or the standard EIS clinic group alone)

Study Record Dates

• First Submitted: June 15, 2026
• First Posted: September 10, 2026
• Study Start: September 15, 2026
• Primary Completion (Estimated): September 15, 2030
• Study Completion (Estimated): April 15, 2031
• Last Updated: September 10, 2026

Record last verified: 2026-06