Evidence map›Paper›PMID 31637640›Full record

ArticleJournal of general internal medicine2020

Sources of Information and Beliefs About the Health Effects of Marijuana.

Julie H Ishida, Alysandra J Zhang, Stacey Steigerwald, Beth E Cohen, Marzieh Vali, Salomeh Keyhani

Abstract read
In one paragraph

Article in Journal of general internal medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers.

0numbers the graph read from it
0cells of the map it votes in
32citing papers in PubMed
–field-weighted citation impact
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

32 citing papers in PubMed.

  1. Trial
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  4. A Classification System for Competing Narratives in a Risk Context.Risk analysis : an official publication of the Society for Risk Analysis · 2025
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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

6 authors.

Julie H IshidaDepartment of Medicine, Division of Nephrology, University of California, San Francisco, San Francisco, CA, USA.
Alysandra J ZhangSan Francisco VA Medical Center, 4150 Clement St., San Francisco, CA, 94121, USA.
Stacey SteigerwaldSan Francisco VA Medical Center, 4150 Clement St., San Francisco, CA, 94121, USA.
Beth E CohenSan Francisco VA Medical Center, 4150 Clement St., San Francisco, CA, 94121, USA.
Marzieh ValiSan Francisco VA Medical Center, 4150 Clement St., San Francisco, CA, 94121, USA.
Salomeh KeyhaniSan Francisco VA Medical Center, 4150 Clement St., San Francisco, CA, 94121, USA. salomeh.keyhani@ucsf.edu.

Funding

Impact of marijuana on adherence, risk factor control and cardiovascular eventsR01HL130484 · NHLBI · NORTHERN CALIFORNIA INSTITUTE/RES/EDU · PI KEYHANI, SALOMEH · 2017 to 2020
$2.9M
Facilitating Appropriate Analgesic Prescription in Hemodialysis PatientsK23DK103963 · NIDDK · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI ISHIDA, JULIE · 2015 to 2018
$621k
NHLBI NIH HHS R01 HL130484NIDDK NIH HHS K23 DK103963
6 · The paper itself

Abstract

backgroundMarijuana is currently legal for recreational use in 10 states and Washington DC while a total of 34 states have implemented varying degrees of medical marijuana. The commercialization of marijuana has been accompanied by a proliferation of false claims regarding the therapeutic potential of marijuana, which are popularized by several different information sources. To date, no study has examined where US adults get their information regarding marijuana.

objectiveTo determine the sources of information associated with believing unsupported claims about marijuana.

designProbability-based online survey

participants16,820 adults, with a response rate of about 55% (N = 9003) MAIN MEASURES: Most influential sources of information about marijuana and belief of statements consistent with misinformation, for example, smoking marijuana has preventative health benefits, secondhand marijuana smoke or use during pregnancy is completely or somewhat safe, and marijuana is not at all addictive. KEY

resultsThere were 9003 respondents (response rate 55%). Forty-three percent believed unsupported claims about marijuana. The most influential sources of information were health professionals, traditional media, friends/relatives, and social media/internet. Individuals reporting social media or the Internet (1.46 CI [1.30, 1.64]), the marijuana industry (e.g., advertisements, dispensaries) (2.88 CI [2.15, 3.88]), and friends or relatives (1.41 CI[1.26, 1.58]) as the most influential source of information about marijuana were more likely to believe any statement consistent with misinformation about marijuana in comparison with those who reported other sources as most influential.

conclusionsIndividuals reporting the most significant source of information regarding marijuana was from social media or the Internet, the marijuana industry, or friends or relatives were more likely to believe unsupported claims about marijuana. Public health campaigns to counter the misinformation about marijuana to the public are needed.

Indexed as

CannabisMarijuana SmokingMedical MarijuanaSocial MediaAdultCommunicationFemaleHumansPregnancySurveys and QuestionnairesMedical Marijuanabeliefsinformation sourcemarijuana

Identifiers

PMID31637640
PMCPMC6957653

What OpenQuestion holds

Textmetadata
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.