Online Brief Advice Intervention for Heavy Cannabis Users (Recalibrate)

January 23, 2026 updated by: King's College London

Randomised-Controlled Trial of an Online Brief Advice Intervention for Heavy Cannabis Users (RECALIBRATE)

This project will evaluate whether a brief online intervention focused on cannabis withdrawal can increase awareness and insight about cannabis use disorder among daily cannabis users. The study will employ a randomised controlled trial design comparing an intervention consisting of a short educational video on cannabis withdrawal and personalised feedback on the Cannabis Withdrawal Scale, against a control condition of a relaxation video and mood questionnaire.

The investigators will aim to recruit at least 100 daily cannabis users (minimum 25 days of cannabis use /month and minimum 3.5g cannabis/week [low-medium daily use]) through Prolific, an online research participant platform. Potential participants will complete a brief screening questionnaire (1 minute) to confirm that participants meet inclusion criteria, before randomisation. The experiment will last 10-15 minutes and will include baseline demographic and substance use measures, the intervention or control condition, and outcome measures.

The primary outcome will be cannabis use awareness and insight as measured by the Substance Use Awareness and Insight Scale (SAS). Secondary outcomes will include intention to change cannabis use. This study aims to determine whether a short online intervention can increase awareness about cannabis withdrawal among heavy users. If successful, subsequent studies will be designed to assess these outcomes over the longer-term.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

100

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 Contact

Study Locations

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
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Adults (>18 years)
  • Daily/near daily cannabis users (25+ days/month, min. 3.5g/week)
  • Sufficiently fluent in English

Exclusion Criteria:

  • Participant is prescribed medical cannabis by a healthcare professional

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: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Educational video
A short educational video on cannabis withdrawal and personalised feedback on the Cannabis Withdrawal Scale
Other: Educational video
Short educational video on cannabis withdrawal and personalised feedback on the Cannabis Withdrawal Scale.
Other Names:
  • Learning video
  • Informational video
Active Comparator: Relaxation video
A relaxation video and mood questionnaire
Other: Relaxation video
Relaxation video and mood questionnaire with personalised feedback
Other Names:
  • Mindfulness video
  • Meditation video
  • Peaceful video

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Substance (cannabis) use awareness and insight scale (SAS)
Time Frame: Day 1
Measured by the Substance Use Awareness and Insight Scale, designed to assess awareness in substance use disorder. Minimum value = 0, maximum value 70. Higher score = worse outcome, less insight and awareness.
Day 1

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Intention to change cannabis use
Time Frame: Day 1
This outcome measures participants' motivation and readiness to alter their cannabis consumption behaviours following the intervention. The Intention to Change Cannabis Use scale will be used which is adapted from Motivation to Stop Scale. Minimum score = 1, maximum score = 7. Higher score = better outcome, higher motivation to stop.
Day 1

Collaborators and Investigators

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

Sponsor

King's College London

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)

October 16, 2025

Primary Completion (Estimated)

September 1, 2026

Study Completion (Estimated)

September 1, 2026

Study Registration Dates

First Submitted

September 22, 2025

First Submitted That Met QC Criteria

January 23, 2026

First Posted (Actual)

January 30, 2026

Study Record Updates

Last Update Posted (Actual)

January 30, 2026

Last Update Submitted That Met QC Criteria

January 23, 2026

Last Verified

October 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • REMAS: 49272

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 User

Clinical Trials on Educational video

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Congo, DR of

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe