An interventional study of Educational video and Relaxation video in Cannabis User, sponsored by King's College London. Recruiting at 1 site in United Kingdom. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-01-30.
Sponsored by King's College London · Not applicable, Interventional, and Other
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.
517 studies on the registry are indexed under Marijuana Abuse; 114 are open to participants now.
This study's planned enrollment of 100 is above the median of 60 across 421 interventional studies indexed under Marijuana Abuse.
Browse Marijuana Abuse studies →King's College London is the lead sponsor of 506 studies on the registry; 125 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
A short educational video on cannabis withdrawal and personalised feedback on the Cannabis Withdrawal Scale
Other: Educational video
A relaxation video and mood questionnaire
Other: Relaxation video
Short educational video on cannabis withdrawal and personalised feedback on the Cannabis Withdrawal Scale.
Also known as: Learning video, Informational video
Relaxation video and mood questionnaire with personalised feedback
Also known as: Mindfulness video, Meditation video, Peaceful video
Substance (cannabis) use awareness and insight scale (SAS)
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.
Time frame: Day 1
Intention to change cannabis use
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.
Time frame: Day 1
Plan to share: No
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King's College London