Systematic review confirms marijuana smoking harms the respiratory system
A systematic review found marijuana smoking associated with multiple respiratory complications including chronic bronchitis symptoms, airway inflammation, and possible links to pneumonia and lung hyperinflation.
Quick Facts
What This Study Found
Marijuana smoking exposes lungs to combustion byproducts that cause airway inflammation, chronic bronchitis symptoms, and possible emphysematous changes. Evidence for associations with asthma, COPD, and pneumonia was also identified.
Key Numbers
Review covered respiratory outcomes including asthma, pneumonia, emphysema, COPD, and chronic bronchitis. Marijuana combustion produces harmful byproducts similar to tobacco smoke.
How They Did This
Systematic review of published literature on respiratory effects of marijuana smoking. Examined outcomes including airway inflammation, bronchitis, asthma, COPD, emphysema, pneumonia, and lung function changes.
Why This Research Matters
As marijuana legalization increases use, understanding respiratory risks is critical. The perception that marijuana smoke is less harmful than tobacco smoke persists despite evidence of significant respiratory irritation.
The Bigger Picture
The respiratory effects of cannabis have been studied less than tobacco, but combustion chemistry suggests similar airway irritant exposure. The shift toward vaping and edibles may change the risk profile, but smoked cannabis remains the most common consumption method.
What This Study Doesn't Tell Us
Many included studies did not adequately control for concurrent tobacco use. Varying definitions of marijuana use frequency across studies. Limited long-term data. Does not address non-smoked cannabis routes.
Questions This Raises
- ?How do vaporized cannabis and smoked cannabis compare in respiratory effects?
- ?Does the frequency and amount of marijuana smoking determine a dose-response relationship with lung damage?
Trust & Context
- Key Stat:
- Marijuana combustion produces respiratory irritants similar to tobacco smoke
- Evidence Grade:
- Systematic review of observational studies. Moderate evidence quality limited by tobacco co-use confounding and heterogeneous study designs.
- Study Age:
- Published 2023.
- Original Title:
- Effects of Smoking Marijuana on the Respiratory System: A Systematic Review.
- Published In:
- Substance abuse, 44(3), 249-260 (2023)
- Authors:
- Vásconez-González, Jorge, Delgado-Moreira, Karen, López-Molina, Belén, Izquierdo-Condoy, Juan S, Gámez-Rivera, Esteban, Ortiz-Prado, Esteban
- Database ID:
- RTHC-04997
Evidence Hierarchy
Analyzes all available research on a topic using a structured method.
What do these levels mean? →Frequently Asked Questions
Is smoking marijuana bad for your lungs?
Yes. This systematic review found marijuana smoking associated with chronic bronchitis symptoms, airway inflammation, and possible links to pneumonia and emphysema. Burning any plant material produces harmful byproducts, and marijuana combustion shares many irritants with tobacco smoke.
Is vaping cannabis safer for the lungs than smoking it?
This review focused on smoked cannabis and did not directly compare routes. Vaporizing heats cannabis below combustion temperature, theoretically producing fewer harmful byproducts. However, vaping carries its own risks (including EVALI outbreaks linked to vitamin E acetate in illicit products), and long-term vaping safety data is limited.
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Cite This Study
https://rethinkthc.com/research/RTHC-04997APA
Vásconez-González, Jorge; Delgado-Moreira, Karen; López-Molina, Belén; Izquierdo-Condoy, Juan S; Gámez-Rivera, Esteban; Ortiz-Prado, Esteban. (2023). Effects of Smoking Marijuana on the Respiratory System: A Systematic Review.. Substance abuse, 44(3), 249-260. https://doi.org/10.1177/08897077231186228
MLA
Vásconez-González, Jorge, et al. "Effects of Smoking Marijuana on the Respiratory System: A Systematic Review.." Substance abuse, 2023. https://doi.org/10.1177/08897077231186228
RethinkTHC
RethinkTHC Research Database. "Effects of Smoking Marijuana on the Respiratory System: A Sy..." RTHC-04997. Retrieved from https://rethinkthc.com/research/vasconez-gonzalez-2023-effects-of-smoking-marijuana
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.