Actively Recruiting
Online Brief Advice Intervention for Heavy Cannabis Users
Led by King's College London · Updated on 2026-01-30
100
Participants Needed
1
Research Sites
45 weeks
Total Duration
On this page
AI-Summary
What this Trial Is About
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.
CONDITIONS
Official Title
Online Brief Advice Intervention for Heavy Cannabis Users
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Adults (over 18 years old)
- Daily or near daily cannabis use (25 or more days per month)
- Cannabis use of at least 3.5 grams per week
- Sufficient fluency in English to participate
You will not qualify if you...
- Currently prescribed medical cannabis by a healthcare professional
AI-Screening
AI-Powered Screening
Complete this quick 3-step screening to check your eligibility
Trial Site Locations
Total: 1 location
1
Denmark Hill
London, Greater London, United Kingdom, SE5 9RS
Actively Recruiting
Research Team
E
Edward Chesney, MRCPsych
CONTACT
How is the study designed?
Study Type
INTERVENTIONAL
Masking
SINGLE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
OTHER
Number of Arms
2
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