Observational studyJMIR formative research2026
Surveillance of Cannabis Strains Using Online Data: Observational Study.
Observational study in JMIR formative research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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.
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.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
Abstract
Background: The flower strains of cannabis are an important attribute that determines product appeal and health impacts. However, there is a lack of surveillance of cannabis strains as the marketplace expands in response to the growing legalization of recreational and medical cannabis. Objective: This study aimed to analyze cannabis strains and their growth using existing data from user-generated reviews on the Leafly website. Methods: Using the time stamps of each review, we constructed a dataset of the number of reviews by strain and year over the period of 2010 to 2023. We further conducted trend analyses using Joinpoint regression. Results: As of December 2023, more than 7000 cannabis strains are available for view or purchase on the website, including more than 6000 that have been reviewed by users or customers. The number of strains with reviews experienced a 13-fold increase from 280 strains in 2010 to 3905 strains in 2023. Strains that are hybrid and contain more than 20% tetrahydrocannabinol experienced the highest growth in review numbers. Conclusions: The rapid growth of strain numbers poses challenges to cannabis regulation. Policymakers who would like to base regulations on product features need to consider the variability of strains, along with other features such as potency levels and product forms.
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Registered trials
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.