Evidence map›Paper›PMID 33464670›Full record

Trial reportAddiction (Abingdon, England)2021

Effects of cannabis use on alcohol consumption in a sample of treatment-engaged heavy drinkers in Colorado.

Hollis C Karoly, J Megan Ross, Mark A Prince, Alexandra E Zabelski, Kent E Hutchison

Open access · greenAbstract readObservational StudyRandomized Controlled Trial
In one paragraph

Trial report in Addiction (Abingdon, England), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
1.6field-weighted citation impact, top 18% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

20 citing papers in PubMed, 19 citations in OpenAlex.

  1. Trial
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  5. Momentary cannabis effects on alcohol use among adults trying to quit or cut back on drinking.Psychology of addictive behaviors : journal of the Society of Psychologists in Addictive Behaviors · 2026
    Article
  6. The Cannabinoid System as a Potential Novel Target for Alcohol-Associated Liver Disease: A Propensity-Matched Cohort Study.Liver international : official journal of the International Association for the Study of the Liver · 2025
    Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 3 institutions in 1 country.

Hollis C KarolyInstitute for Cognitive Science, University of Colorado Boulder, Boulder, CO, USA.ORCID 0000-0002-1232-1202
J Megan RossDepartment of Psychiatry, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.ORCID 0000-0003-4424-5301
Mark A PrinceDepartment of Psychology, Colorado State University, Fort Collins, CO, USA.ORCID 0000-0002-8848-0568
Alexandra E ZabelskiInstitute for Cognitive Science, University of Colorado Boulder, Boulder, CO, USA.
Kent E HutchisonInstitute for Cognitive Science, University of Colorado Boulder, Boulder, CO, USA.ORCID 0000-0002-4805-9277
University of Colorado Boulder · USColorado State University · USUniversity of Colorado Anschutz Medical Campus · US

Funding

Research Training-Genetics of Substance AbuseT32DA017637 · NIDA · UNIVERSITY OF COLORADO AT BOULDER · PI STITZEL, JERRY A · 2004 to 2023
$5.3M
Dismantling MBRP: Identifying Critical Neuroimmune Mechanisms of ActionR01AA024632 · NIAAA · UNIVERSITY OF COLORADO DENVER · PI HUTCHISON, KENT E. · 2016 to 2020
$3.0M
NIAAA NIH HHS R01 AA024632NIDA NIH HHS T32 DA017637
6 · The paper itself

Abstract

BACKGROUND AND

aimsCannabis is commonly used among people who drink alcohol, but evidence suggests a nuanced relationship between alcohol consumption and cannabis use. In particular, among individuals undergoing alcohol treatment the impact of cannabis on alcohol intake may depend upon cannabis use frequency. We aimed to test the effects of within-day cannabis use on total drinks consumed and likelihood of binge drinking on a given day among all participants and compare these relationships between males and females and between individuals who reported infrequent and frequent cannabis use.

designThis observational study is a substudy of a larger randomized controlled trial (RCT). Individuals were included from the RCT if they reported any cannabis use and were divided into groups based on cannabis use patterns. Alcohol use was compared within and between groups.

settingIndividuals were recruited from 2016 to 2020 from community and university settings in Denver and Boulder, CO, USA.

participantsOf the 182 individuals enrolled in the RCT, 96 cannabis-using subjects were included in these analyses. MEASUREMENTS: Subjects completed a time-line follow-back (TLFB) at baseline, 4, 8 (end of treatment) and 20 weeks. Daily data on alcohol and cannabis use from the TLFB at all time-points were analyzed.

findingsAcross the sample (n = 96), individuals drank approximately 29% fewer drinks [95% confidence interval (CI) = 18-39%, P < 0.001] and were 2.06 times (95% CI =1.37-3.08, P < 0.001) less likely to have a binge-drinking episode on days that cannabis was used compared with days that cannabis was not used. These patterns were observed in males, females and the infrequent and frequent cannabis use groups. Findings were inconclusive regarding differences in the association between cannabis use and alcohol outcomes when comparing males and females and when comparing infrequent and frequent cannabis use groups.

conclusionsHeavy drinkers engaged in treatment to reduce their alcohol consumption who also use cannabis appear to increase their cannabis use on days when they reduce their alcohol consumption.

Indexed as

Alcoholic IntoxicationCannabisAlcohol DrinkingColoradoEthanolHumansEthanolAlcoholcannabiscomplementarityinterventionmulti-level modelingsubstitution

Identifiers

PMID33464670
PMCPMC8286984
OpenAlexW3126032973

What OpenQuestion holds

Textmetadata
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Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.