Mobile app helped heavy cannabis users reduce use by half | Research

The takeaway

A mobile contingency management app helped heavy cannabis users reduce from daily use (94% of days) to use on 47% of days and from 1.42 grams daily to 0.61 grams, with at least half of heavy users achieving 50% reduction.

Heavy cannabis users wanting to cut back, digital health developers, cannabis treatment researchers

94% to 47% use days

What the researchers found

During the baseline ad lib phase, participants used cannabis on 94% of days at 1.42 grams daily. During the 6-week intervention, use decreased to 47% of days at 0.61 grams daily. In the final cohort, at least 50% of heavy users reduced use by 50% or more.

Why it matters

Most cannabis interventions focus on abstinence but fail to achieve sustained abstinence. This study explores whether cannabis reduction (rather than cessation) is achievable and could be a viable treatment goal for heavy users.

The numbers in context

18 enrolled, 13 analyzed (80%+ adherent). Baseline: 94% use days, 1.42 g/day. Intervention: 47% use days, 0.61 g/day. 50%+ of heavy users achieved 50%+ reduction in final cohort.

How the study worked

Pilot study with 18 participants (10 women) across 3 cohorts. 2-week baseline ecological momentary assessment followed by 6-week reduction phase. Mobile app tracked use via saliva tests (bioverified abstinence) and electronic diaries. 13 of 18 were adherent (80%+ to EMA prompts).

What this study cannot tell us

Very small sample (13 analyzed). No control group. Cannot determine whether reduction sustains beyond 6 weeks. High adherence threshold may have selected more motivated participants. Functional/mental health outcomes not yet measured.

How to read the evidence

Small pilot study without control group provides proof of concept but cannot establish efficacy.

When this study was published

2024 pilot study of mobile contingency management for cannabis reduction

The bigger picture

If cannabis reduction improves functional and mental health outcomes (which this study did not measure but was designed to enable future testing), it would parallel the harm reduction approach gaining acceptance in alcohol use disorder treatment.

Questions still open

Does reducing cannabis use (without stopping) actually improve mental health and functioning? Can this mobile approach scale beyond a research setting? How long do reductions sustain after the intervention ends?

Common questions

Can a phone app help reduce cannabis use?

In this small pilot, a mobile app that tracked cannabis use through saliva tests and diaries helped heavy users cut their use roughly in half over 6 weeks. Larger controlled studies are needed to confirm efficacy.

Why focus on reduction instead of quitting?

Most interventions for cannabis use disorder fail to achieve sustained abstinence. This study tested whether reduction is achievable as a first step, with plans to evaluate whether reduction improves health outcomes.

Read the original research

Development of Mobile Contingency Management for Cannabis Use Reduction.

Behavior therapy, 55(1), 1-13

View on PubMed ↗Publisher’s paper ↗

Citation

Beckham, Jean C; Calhoun, Patrick S; Chen, Zhengxi; Dennis, Michelle F; Kirby, Angela C; Treis, Emili T; Hertzberg, Jeffrey S; Hair, Lauren P; Mann, Adam J; Budney, Alan J; Kimbrel, Nathan A. (2024). Development of Mobile Contingency Management for Cannabis Use Reduction.. Behavior therapy, 55(1), 1-13. https://doi.org/10.1016/j.beth.2023.03.004