What Would Happen If Sweden Decriminalized Cannabis? A Predictive Model
Modeling predicts cannabis decriminalization in Sweden would cause an immediate spike in reported use, but while experimental use would stabilize, regular use could keep rising — potentially indicating growing dependence.
Quick Facts
What This Study Found
Multilevel meta-regression using 12 countries predicted decriminalization would increase both past-12-month and past-30-day cannabis use in Sweden immediately, with experimental use stabilizing but regular use continuing to climb.
Key Numbers
Data from 25 countries (12 with both GDPI and Hofstede scores); predicted immediate increase in both 12-month and 30-day use; 12-month use gap narrows over time while 30-day use gap widens.
How They Did This
Cross-national multilevel meta-regression model using jurisdiction-level self-reported cannabis use data from 12 countries and 4 US states to predict prevalence changes following hypothetical decriminalization.
Why This Research Matters
Sweden's debate over drug policy reform needs evidence-based predictions — this model distinguishes between experimental use (which stabilizes) and regular use (which may indicate growing dependence), a crucial policy distinction.
The Bigger Picture
The divergence between experimental and regular use trends after decriminalization suggests that while curiosity-driven use levels off, the pool of dependent users may grow — a pattern policymakers should anticipate.
What This Study Doesn't Tell Us
Predictions based on other countries' experiences may not account for Sweden's unique cultural attitudes; self-report data may reflect disclosure willingness rather than actual use changes; model assumes comparable policy implementation.
Questions This Raises
- ?How much of the initial increase reflects genuine new use versus increased willingness to report?
- ?What complementary harm reduction policies could mitigate the projected rise in regular use?
Trust & Context
- Key Stat:
- Evidence Grade:
- Novel multilevel meta-regression approach with international data, but predictions are inherently uncertain and depend on comparability of national contexts.
- Study Age:
- Published in 2026 using 2021 baseline data, relevant to Sweden's ongoing drug policy debate.
- Original Title:
- Expected population prevalence following decriminalization of recreational use of cannabis in Sweden.
- Published In:
- Journal of cannabis research, 8(1) (2026)
- Authors:
- Andersson, Filip, Ramstedt, Mats, Thiesmeier, Robert, Magnusson, Cecilia, Orsini, Nicola, Galanti, Maria Rosaria
- Database ID:
- RTHC-08082
Evidence Hierarchy
A snapshot of a population at one point in time.
What do these levels mean? →Frequently Asked Questions
Would decriminalization increase cannabis use?
This model predicts an initial increase in reported use, but experimental use would likely stabilize while regular/frequent use could continue rising over time.
Does the initial spike represent real new users?
It's unclear whether initial increases reflect genuine new use or simply increased willingness to report cannabis use when legal penalties are removed.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-08082APA
Andersson, Filip; Ramstedt, Mats; Thiesmeier, Robert; Magnusson, Cecilia; Orsini, Nicola; Galanti, Maria Rosaria. (2026). Expected population prevalence following decriminalization of recreational use of cannabis in Sweden.. Journal of cannabis research, 8(1). https://doi.org/10.1186/s42238-026-00405-z
MLA
Andersson, Filip, et al. "Expected population prevalence following decriminalization of recreational use of cannabis in Sweden.." Journal of cannabis research, 2026. https://doi.org/10.1186/s42238-026-00405-z
RethinkTHC
RethinkTHC Research Database. "Expected population prevalence following decriminalization o..." RTHC-08082. Retrieved from https://rethinkthc.com/research/andersson-2026-expected-population-prevalence-following
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.