Development and Testing of the Effects of a Digital Intervention for Reducing Cannabis-Related Risks
Résumé de l'étude
Even though many people consume cannabis and numerous states are legislating to regulate its sale, cannabis consumption is associated with various health risks. As part of a pilot trial for the sale of recreational cannabis, we developed a prevention intervention aimed at promoting risk reduction. Different modules were developed and pre-tested by small groups from the target population. Feedback from the target population helped improve the intervention and produce a prototype that will be tested in this study. The objective of the study is to test the effects of the developed intervention on 565 adult cannabis consumers participating in the pilot trial for the sale of cannabis in Lausanne. The different modules of the intervention will be offered or not to participants randomly. This will allow us to compare the effects of the different modules on the consumption behavior of participants who will complete a follow-up questionnaire 1 month and 7 months after gaining access to the intervention.
(BASEC)
Intervention étudiée
Digital intervention (web application) promoting the reduction of cannabis-related risks
(BASEC)
Maladie en cours d'investigation
Reduction of risks related to recreational cannabis consumption
(BASEC)
Adult cannabis consumers (18+) residing in the city of Lausanne, included in the pilot trial for the sale of recreational cannabis Cann-L and agreeing to share their follow-up data. (BASEC)
Critères d'exclusion
Pregnant and breastfeeding individuals, minors, individuals with a health issue for which cannabis consumption is contraindicated (e.g., severe psychiatric disorders). (BASEC)
Lieu de l’étude
Lausanne
(BASEC)
Sponsor
Centre hospitalier universitaire vaudois (CHUV)
(BASEC)
Contact pour plus d'informations sur l'étude
Personne de contact en Suisse
Jacques Gaume
+41213144105
jacques.gaume@clutterchuv.chCentre hospitalier universitaire vaudois (CHUV) - Service de médecine des addictions
(BASEC)
Informations générales
University of Lausanne Hospitals
+41 21 314 41 05+41 21 314 41 05
jacques.gaume@clutterchuv.chjacques.gaume@clutterchuv.ch(ICTRP)
Informations générales
University of Lausanne Hospitals
(ICTRP)
Nom du comité d'éthique approbateur (pour les études multicentriques, uniquement le comité principal)
Commission cantonale d'éthique du Vaud
(BASEC)
Date d'approbation du comité d'éthique
10.11.2025
(BASEC)
Identifiant de l'essai ICTRP
NCT07157540 (ICTRP)
Titre officiel (approuvé par le comité d'éthique)
Testing the Effects of a Digital Intervention for Cannabis Harm Reduction – The Cann’App fractional factorial randomized controlled trial (BASEC)
Titre académique
Testing the Effects of a Digital Intervention for Cannabis Harm Reduction - The Cann'App Fractional Factorial Randomized Controlled Trial (ICTRP)
Titre public
Testing the Effects of Cann'App, a Digital Intervention for Cannabis Harm Reduction (ICTRP)
Maladie en cours d'investigation
Cannabis UseHarm Reduction (ICTRP)
Intervention étudiée
Behavioral: Personalized Feedback on Cannabis Protective Behavioral Strategies, Cannabis Use, Cannabis Expenditures, and Cannabis-Related Consequences (PF)Behavioral: Imagining the Future Using Counterfactual Thinking and Episodic Future Thinking (IMAGIN)Behavioral: Behavioral Economics-Informed Exercises to Increase Motivation to Engage in Substance-Free Activities (SFAS)Behavioral: Information (ICTRP)
Type d'essai
Interventional (ICTRP)
Plan de l'étude
Allocation: Randomized. Intervention model: Factorial Assignment. Primary purpose: Prevention. Masking: Triple (Participant, Investigator, Outcomes Assessor). (ICTRP)
Critères d'inclusion/exclusion
Inclusion Criteria:
- Eligible participants will be those included in the pilot trial of cannabis sales
regulation in Lausanne, Switzerland (Cann-L study).
Inclusion criteria in Cann-L study are:
- being adult (>18 years old),
- having current cannabis use (i.e., use at least once a month over the last 6 months)
- living in the city of Lausanne. To enter the study, they complete an entry
assessment verifying their age and proof of residence, and confirming that they have
current cannabis use.
Exclusion Criteria:
- Cann-L exclusion criteria comprise:
- being younger than 18 years old,
- being pregnant or breastfeeding,
- having a health condition contraindicating the use of cannabis (e.g., severe
psychiatric disorder).
The consent to participate in the Cann-L parent trial comprises an option to be contacted
to participate in sub-studies, including studies on prevention measures. All participants
having accepted to be so contacted will be proposed to participate in the present study.
Therefore, additional exclusion criteria for the present study include:
- not providing informed consent to participate in sub-studies, including studies on
prevention measures,
- not providing informed consent to participate in the present study. (ICTRP)
non disponible
Critères d'évaluation principaux et secondaires
Frequency of Protective Behavioral Strategies for Marijuana Use as Measured by the PBSM-17 Short Form Scale (ICTRP)
Cannabis Use Frequency;Number of Hours High on a Typical Day (ICTRP)
Date d'enregistrement
non disponible
Inclusion du premier participant
non disponible
Sponsors secondaires
Swiss National Science Foundation;Apptitude;Addiction Switzerland (ICTRP)
Contacts supplémentaires
Jacques Gaume, PhDJacques Gaume, PhDJacques Gaume, PhD, jacques.gaume@chuv.chjacques.gaume@chuv.ch, +41 21 314 41 05+41 21 314 41 05, University of Lausanne Hospitals (ICTRP)
ID secondaires
10001E_220072, 2025-00428 (ICTRP)
Résultats-Données individuelles des participants
non disponible
Informations complémentaires sur l'essai
https://clinicaltrials.gov/study/NCT07157540 (ICTRP)
Résultats de l'essai
Résumé des résultats
non disponible
Lien vers les résultats dans le registre primaire
non disponible