After 4 weeks of incentivized cannabis abstinence, 68% of non-treatment-seeking youth wanted to reduce or quit, and those without cannabis use disorder showed significant reductions in use even 4 weeks after incentives ended.
People interested in harm reduction approaches for cannabis use among young people not seeking treatment.
68.4% wanted to reduce or quit after experiencing abstinence
What the researchers found
Abstinence-incentivized participants showed significant reductions in cannabis use frequency and biochemically verified THC metabolites at 4-week follow-up compared to monitoring-only controls. 68.4% of abstinence participants set goals to reduce or quit after the intervention. Those without CUD who set reduction goals showed the greatest decreases.
Why it matters
Most young cannabis users are not seeking treatment. This study shows that a brief period of incentivized abstinence can shift attitudes and reduce use even in youth who were not motivated to change, suggesting a viable harm reduction strategy.
The numbers in context
220 participants. Group-by-time interaction significant (days/week: p=.005; times/week: p<.001; CN-THCCOOH: p=.004). 68.4% set reduction/abstinence goals post-intervention. Greatest reductions in those without CUD who set goals.
How the study worked
Randomized trial of 220 non-treatment-seeking youth. 126 randomized to 4-week abstinence-based contingency management (incentivized) and 94 to monitoring only. Cannabis use measured by self-report and creatinine-adjusted urine THC-COOH at baseline, end of intervention, and 4-week follow-up.
What this study cannot tell us
Relatively short follow-up (4 weeks post-intervention). Youth without CUD responded best, so this may be less effective for those with established disorders. Financial incentives may not be scalable in all settings. Cannot determine durability beyond 4 weeks.
How to read the evidence
Randomized controlled trial with biochemical verification of cannabis use. Strong design, though limited by short follow-up and the finding that CUD patients responded less well.
When this study was published
Published in 2024 in Drug and Alcohol Dependence.
The bigger picture
Contingency management is well-established for other substances but underused for cannabis. This study demonstrates it can generate motivation to change even in people who were not looking for help, which could be valuable as cannabis use becomes more normalized.
Questions still open
- How long do the attitude and behavior changes persist beyond 4 weeks? Would booster incentive periods maintain the gains? Could this approach be implemented in school or primary care settings?
Common questions
Can incentives help people cut back on cannabis?
Did the benefits last after incentives stopped?
Read the original research
Contingency management is associated with positive changes in attitudes and reductions in cannabis use even after discontinuation of incentives among non-treatment seeking youth.
Drug and alcohol dependence, 256, 111096
Citation
Cooke, Megan E; Knoll, Sarah J; Streck, Joanna M; Potter, Kevin; Lamberth, Erin; Rychik, Natali; Gilman, Jodi M; Evins, A Eden; Schuster, Randi M. (2024). Contingency management is associated with positive changes in attitudes and reductions in cannabis use even after discontinuation of incentives among non-treatment seeking youth.. Drug and alcohol dependence, 256, 111096. https://doi.org/10.1016/j.drugalcdep.2024.111096
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