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Updated: Nov 22, 2025

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ICan, an Internet-based intervention to reduce cannabis use: study protocol for a randomized controlled trial.

Marleen I A Olthof1,2, Matthijs Blankers3,4,5, Margriet W van Laar3

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Summary

This study introduces ICan, an internet-based intervention for heavy cannabis users, combining screening, brief intervention (using CBT and MI), and referral to treatment. It aims to reduce cannabis use and improve attitudes toward substance use treatment.

Keywords:
CannabisInterventionSBIRTSubstance use disorderWeb-based programeHealth

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Area of Science:

  • Addiction research
  • Digital health interventions
  • Public health

Background:

  • Heavy cannabis use presents significant physical and mental health risks.
  • Many heavy cannabis users do not seek professional help despite available treatments.
  • Web-based interventions offer an alternative but often have small effect sizes and high attrition rates.

Purpose of the Study:

  • To evaluate the effectiveness of the ICan intervention for reducing cannabis use.
  • To assess the impact of ICan on attitudes towards seeking help and entering specialized treatment.
  • To compare ICan against educational online modules in Dutch frequent cannabis users.

Main Methods:

  • A randomized controlled trial (RCT) design was employed.
  • Participants were frequent cannabis users in the Netherlands.
  • The primary outcome was the frequency of cannabis use, with secondary outcomes including quantity used, help-seeking attitudes, and treatment entry.

Main Results:

  • Results are pending as this is a protocol paper.
  • The study aims to determine if ICan is more effective than standard online information.
  • Secondary outcomes will provide insights into treatment seeking behavior.

Conclusions:

  • ICan is the first internet-based intervention integrating screening, brief intervention (based on CBT and MI), and referral for cannabis users.
  • This approach may improve treatment utilization and reduce cannabis use.
  • Further research is needed to confirm the effectiveness and impact of ICan.