Cannabis simultaneously raises and lowers immune markers in habitual users
Belvederi Murri M, Guglielmo R, Zizzi A, Muscettola A, Nanni MG
Medicinal Plants
Cannabis you might grow as a medicinal herb or fiber crop produces compounds that nudge the human immune system in two directions at once, a complexity that shapes how researchers and growers should think about its therapeutic value.
Scientists pooled results from 46 studies covering more than 54,000 people to figure out what cannabis does to the immune system. They found that cannabis users tend to have higher levels of both the chemicals that stoke inflammation and the ones that tamp it down, at the same time. That dual push-pull suggests the plant's compounds act more like a thermostat than a simple on-off switch for immunity.
Key Findings
In observational studies, cannabis users showed elevated anti-inflammatory biomarkers (SMD=0.298) AND pro-inflammatory biomarkers (SMD=0.166) concurrently, indicating immunomodulation rather than a directional shift.
CBD-specific clinical trials showed only a small, uncertain increase in pro-inflammatory markers (SMD=0.15; 90.9% probability of direction), suggesting cannabinoid type matters for immune outcomes.
Effects differed significantly by demographic factors, use of synthetic vs. plant-derived cannabinoids, and recency of use across 54,382 participants from 46 studies.
chevron_right Technical Summary
A large meta-analysis of 46 studies found that regular cannabis use is linked to simultaneous increases in both pro- and anti-inflammatory markers in the blood, pointing to immunomodulation rather than a simple inflammatory or anti-inflammatory effect. Results varied by cannabinoid type, recency of use, and population demographics.
Abstract Preview
Original paper
Regular cannabinoid use and inflammatory biomarkers: Systematic review and hierarchical meta-analysis.
Cannabis use is rising, with both therapeutic and harmful uses that might involve inflammation. Preclinical studies and findings in humans are inconsistent. It remains unclear whether cannabinoids ...
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