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Do more cannabis stores near schools mean more teens use cannabis? Our research suggests the answer is complicated (opens in a new tab)

medicalxpress.com · 2026-10-27

Short answerEvidenceSource

Short answer

Mostly supported

Mostly supported.

The claims we could check match the study, but some claims were not covered by the evidence reviewed.

  • 3 supported
  • 1 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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1

The story

Do more cannabis stores near schools mean more teens use cannabis? Our research suggests the answer is complicated

medicalxpress.com · 2026-10-27

The story’s checkable claims.

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2

NewsLink checks it

Mostly supported

Every claim we could check holds up. Three of four claims match the study. This overall rating is based only on the claims we could check. One claim the study doesn't address.

  • 3 supported
  • 1 not covered
Open claim evidence
3
Source paper

Source layer

The 6 papers the story cites

Source study separated from background citations.

The research anchor for the report.

Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

4 claims in this story

Showing all 4 claimsChoose a verdict to focus the list.

Claim 1 of 4Not coveredThe researchers say retail proximity may not capture how adolescents actually obtain cannabis, because they may get it through friends, family members or other social connections.View evidenceHide evidence

Why this verdict

The abstract-level profile supports the broader idea that objective school-area retail accessibility may not capture all relevant access constructs, because perceived ease of access was strongly associated with use and only modestly correlated with objective retail accessibility. However, the specific explanation that adolescents may obtain cannabis through friends, family members, or other social connections—and that the researchers said this—is not directly verifiable from the supplied abstract-depth profile.

1

Study evidence

Self-reported perceived ease of access was strongly associated with adolescent cannabis use across the examined outcomes.

“Perceived ease of access was strongly associated with cannabis use but modestly correlated with retail accessibility.”
Claim 2 of 4SupportedThe article asks whether more cannabis stores near high schools mean more teens use cannabis, and says the answer is complicated.View evidenceHide evidence

Why this verdict

The paper profile supports the headline’s broad, hedged framing: the main study question was whether school-area licensed cannabis retailer accessibility was associated with adolescent cannabis use, and the abstract-level findings were mixed—generally small/inconsistent/null associations for use outcomes, an early association with frequency among users, and stronger relevance of perceived access. The headline is a question and does not outrun the body’s associational framing.

1

Study evidence

Past 12-month cannabis use declined from 22.2% in 2018 to 10.0% in 2023 among secondary school students in the COMPASS sample.absolute prevalence decline from 22.2% to 10.0% (2018→2023)

“Repeat cross-sectional data were drawn from the COMPASS study (2018-2023), including 419,887 students across Alberta, British Columbia, Ontario, and Quebec.”
2

Study evidence

Among students who reported cannabis use, greater geographic accessibility to retailers was associated with higher frequency of use in 2018; this relationship disappeared as retail availability expanded in later years.

“Multilevel ordinal regression assessed use frequency among users.”
Claim 3 of 4SupportedAcross more than 419,000 student survey responses from four Canadian provinces, the researchers found little consistent evidence that greater access to nearby cannabis retailers was associated with whether adolescents used cannabis.View evidenceHide evidence

As statedmore than 419,000 student survey responses

Why this verdict

The profile reports 419,887 COMPASS student responses across Alberta, British Columbia, Ontario, and Quebec, linked to school-area geospatial retailer-accessibility measures. It also reports that associations with cannabis use outcomes were generally small, inconsistent, and often non-significant, with 264 sensitivity specifications supporting null effects.

1

Study evidence

Past 12-month cannabis use declined from 22.2% in 2018 to 10.0% in 2023 among secondary school students in the COMPASS sample.absolute prevalence decline from 22.2% to 10.0% (2018→2023)

“Repeat cross-sectional data were drawn from the COMPASS study (2018-2023), including 419,887 students across Alberta, British Columbia, Ontario, and Quebec.”
2

Study evidence

Sensitivity analyses across 264 model specifications supported null effects for associations between spatial cannabis retail accessibility and adolescent cannabis use outcomes.generally null / small / inconsistent

“Sensitivity analyses across 264 model specifications supported null effects.”
Claim 4 of 4SupportedAccessibility was associated with more frequent use among existing cannabis users during the first year of legalization, but that association weakened and was no longer statistically significant in later years.View evidenceHide evidence

As statedfirst year of legalization

Why this verdict

The profile states that among students who reported cannabis use, greater geographic accessibility was associated with higher use frequency in 2018, and that this relationship disappeared as retail availability expanded. The story’s wording is associational and appropriately hedged, though the abstract profile gives this qualitatively rather than with numerical estimates or p-values.

1

Study evidence

Among students who reported cannabis use, greater geographic accessibility to retailers was associated with higher frequency of use in 2018; this relationship disappeared as retail availability expanded in later years.

“Multilevel ordinal regression assessed use frequency among users.”
Then look for missing context

Context layer

What the story left out

Important study details the story did not include.

  • Main exposure and outcomes: objective accessibility was measured using distance to nearest retailer, retailer density, and inverse-distance-weighted density within 2000 m of schools; outcomes included ever use, past 12-month use, past 30-day use, and daily/almost daily use.

    The story reflects the general concept of cannabis retailers near schools and adolescent use, but it does not convey the multiple specific exposure metrics or the multiple use outcomes assessed.

    From Repeat cross-sectional multilevel observational study

  • Robustness finding: sensitivity analyses across 264 model specifications supported null effects for objective retail-accessibility associations with cannabis use outcomes.

    The story conveys the overall null/inconsistent conclusion, but it does not mention the extensive sensitivity-analysis component or the 264 model specifications.

    From Specification-curve / multiverse sensitivity analysis

  • Perceived access finding: perceived ease of access was strongly associated with cannabis use and was only modestly correlated with objective retail accessibility measures.

    The story gestures toward retail proximity not fully capturing access and mentions possible social channels, but it does not report the paper’s distinct perceived-access result or its strong association with cannabis use.

    From Repeat cross-sectional school-based survey linked to geospatial retail data

5 things the story did carry across
  • Primary design and dataset: repeat cross-sectional COMPASS student survey data from 2018–2023, including 419,887 secondary school students across four Canadian provinces, linked to school-area geospatial cannabis retailer accessibility measures.
  • Main finding: objective spatial accessibility measures had generally small, inconsistent, and often non-significant associations with adolescent cannabis use outcomes.
  • Conditional frequency finding: among students who reported cannabis use, greater geographic accessibility was associated with higher use frequency in 2018, but the relationship disappeared as retail availability expanded.
  • Limitation: the study is observational and repeat cross-sectional, so it assesses associations over time but cannot establish causality or follow the same students longitudinally.
  • Measurement caveat: cannabis use and perceived access were self-reported, and objective retail accessibility was measured around schools rather than directly measuring where students obtained cannabis.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

4

Evidence read

study summary

Lead result

human in vivo

1Lead resulthuman in vivoAssess whether spatial accessibility to licensed cannabis retailers around schools is associated with adolescent cannabis use outcomes over time in Canada (2018–2023).Repeat cross-sectional multilevel observational studyExpand

In plain English

Repeat cross-sectional analysis of COMPASS student survey data (2018–2023; n=419,887 across four provinces) linked to school-level geospatial measures of licensed cannabis retail accessibility to test associations between retailer proximity/density and multiple adolescent cannabis use outcomes using multilevel regression models.

Key findings

  • Past 12-month cannabis use declined from 22.2% in 2018 to 10.0% in 2023 among secondary school students in the COMPASS sample.absolute prevalence decline from 22.2% to 10.0% (2018→2023)
  • Spatial accessibility measures (distance, density, inverse-distance-weighted density within 2000 m) showed generally small, inconsistent, and often non-significant associations with adolescent cannabis use outcomes in multilevel models.generally small/inconsistent; often non-significant (qualitative)
“Repeat cross-sectional data were drawn from the COMPASS study (2018-2023), including 419,887 students across Alberta, British Columbia, Ontario, and Quebec.”
What this piece can’t prove
  • Observational repeat cross-sectional design (COMPASS), which assesses associations over time but does not establish causality.
2human in vivoTest robustness of the retailer-accessibility–use associations via extensive sensitivity analyses across many model specifications.Specification-curve / multiverse sensitivity analysisExpand

In plain English

The paper reports a specification-curve / multiverse-style sensitivity analysis spanning 264 model specifications to test robustness of associations between spatial cannabis retail accessibility and adolescent cannabis use; these sensitivity analyses supported largely null (small/inconsistent/non-significant) associations across the alternative model choices.

Key findings

  • Sensitivity analyses across 264 model specifications supported null effects for associations between spatial cannabis retail accessibility and adolescent cannabis use outcomes.generally null / small / inconsistent
“Sensitivity analyses across 264 model specifications supported null effects.”
What this piece can’t prove
  • Robustness across specifications does not address residual confounding, measurement error in exposures or outcomes, or temporal changes in market context that could affect associations.

2 further details could not be confirmed from the summary.

3human in vivoAmong students who use cannabis, assess whether retail accessibility is associated with higher frequency of use and whether this changes as the retail market matures.Multilevel ordinal regression among cannabis usersExpand

In plain English

Conditional analysis among students who reported cannabis use: multilevel ordinal regression linked student survey data (COMPASS 2018–2023) to geospatial retail-accessibility measures to assess whether greater geographic accessibility was associated with higher frequency of use and whether that association changed as the retail market matured. Greater accessibility was associated with higher use frequency in 2018, but this relationship disappeared as retail availability expanded.

Key findings

  • Among students who reported cannabis use, greater geographic accessibility to retailers was associated with higher frequency of use in 2018; this relationship disappeared as retail availability expanded in later years.
“Multilevel ordinal regression assessed use frequency among users.”
What this piece can’t prove
  • Abstract does not report numeric effect estimates, measures of precision, or sample size for the subgroup of users, limiting quantitative appraisal.
  • Repeat cross-sectional observational design limits causal inference and is susceptible to unmeasured confounding.

1 further detail could not be confirmed from the summary.

4human in vivoCompare perceived ease of access to cannabis with objective retail accessibility measures and relate perceived access to adolescent cannabis use.Repeat cross-sectional school-based survey linked to geospatial retail dataExpand

In plain English

In repeat cross-sectional data from secondary school students (COMPASS, 2018–2023, N=419,887), self-reported perceived ease of access to cannabis was strongly associated with adolescent cannabis use, whereas objective geospatial retail accessibility measures showed generally small, inconsistent, and often non-significant associations; perceived access was only modestly correlated with objective retail accessibility measures.

Key findings

  • Self-reported perceived ease of access was strongly associated with adolescent cannabis use across the examined outcomes.
  • Objective geospatial measures of retail accessibility (distance to nearest retailer, retailer density, inverse distance weighted density within 2000 m) showed generally small, inconsistent, and often non-significant associations with adolescent cannabis use.
“Perceived ease of access was strongly associated with cannabis use but modestly correlated with retail accessibility.”
What this piece can’t prove
  • Repeat cross-sectional observational design limits causal inference about the effect of perceived or objective accessibility on use.
  • Perceived access is self-reported and may be influenced by reporting biases or unmeasured individual/contextual factors.

1 further detail could not be confirmed from the summary.

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Method layer

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 20 candidate papers

And 14 more candidates considered.