An App to Reduce Cannabis Use Among Emerging Adults

June 10, 2025 updated by: Inbal Billie Nahum-Shani, University of Michigan

Pilot Project 1. Feasibility Pilot of a JITAI to Reduce Cannabis Use Among Emerging Adults

This study is being completed to pilot prevention methods to promote wellness and reduce risky behaviors, including the use of substances such as cannabis. This study will help researchers learn about ways of delivering this information that is both appealing and helpful to young adults who use mobile apps.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

122

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Michigan
      • Ann Arbor, Michigan, United States, 48109
        • University of Michigan

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Reside in the US
  • Speak and read English
  • Have a smartphone on which the app can be downloaded
  • Screen positive for cannabis use 3 or more times each week over the past month
  • Report motivation to change cannabis as 1 or higher (using scale of 0-10)
  • Meet Study verification criteria (i.e., use of CAPTCHA, IP address checks)

Exclusion Criteria:

  • Use of Medical Cannabis
  • Failure to meet study verification criteria

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Other
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: JITAI

Experimental: Within-participant micro-randomization

Twice daily in the study, a participant is assigned to receive a message or no message. The micro-randomization will be performed by a reinforcement learning algorithm based on the participant's engagement with the intervention.
Other: Just-In-Time-Adaptive-Intervention (JITAI)

Behavioral: MiWaves behavioral messages

Participants will be using the MiWaves mobile app for 30 days. When a participant is assigned to receive a message, a message will be randomly selected from a pool of intervention message sets. Messages are based in motivational interviewing and include affect management and behavioral economic strategies.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
App Feasibility
Time Frame: 1 month
% of participants who consented to the study who download the MiWaves app.
1 month
App Acceptability
Time Frame: 1 month
Participants will complete acceptability ratings for the MiWaves app within their post-test assessment (percent with positive rating).
1 month

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of Michigan

Collaborators

National Institute on Drug Abuse (NIDA)

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

February 21, 2024

Primary Completion (Actual)

May 28, 2024

Study Completion (Actual)

May 28, 2024

Study Registration Dates

First Submitted

April 6, 2023

First Submitted That Met QC Criteria

April 19, 2023

First Posted (Actual)

April 24, 2023

Study Record Updates

Last Update Posted (Actual)

June 12, 2025

Last Update Submitted That Met QC Criteria

June 10, 2025

Last Verified

June 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • HUM00222194
  • 5P50DA054039-02 (U.S. NIH Grant/Contract)

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Cannabis Use

Clinical Trials on Just-In-Time-Adaptive-Intervention (JITAI)

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Estonia

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe