Vaping cannabis reduces exposure to combustion toxicants compared to smoking, but both produce similar cardiovascular effects and vaping introduces its own respiratory concerns—neither is harmless.
Cannabis vapers, pulmonologists, cardiologists, and public health officials crafting harm reduction messages.
What the researchers found
As cannabis legalization shifts consumption patterns toward vaping, this review compares what we know about the health effects of the two main inhalation methods.
The good news for vaping: it reduces exposure to the combustion byproducts (tar, carbon monoxide, polyaromatic hydrocarbons) that make smoking harmful. It also allows better modulation of THC bioavailability—users can more precisely control their intake.
The concerning news: both smoking and vaping produce comparable cardiovascular effects, including acute increases in heart rate and blood pressure, and altered immune responses in the lungs. The heart doesn't care whether THC arrived via smoke or vapor—the cardiovascular pharmacology is the same.
Vaping also introduces its own distinct risks. E-cigarette or vaping-associated lung injury (EVALI) has been clearly associated with THC vaping. Vaping is linked to increased respiratory symptoms even in the absence of EVALI. And the long-term consequences—chronic obstructive pulmonary disease, lung cancer, cardiovascular events—remain unknown because vaping is too recent for longitudinal data.
The review's conclusion is measured: vaping may mitigate some combustion-related harms compared to smoking, but it introduces distinct respiratory and cardiovascular concerns. The evidence does not support treating vaping as "safe"—only as potentially "less harmful in some specific ways."
Why it matters
The public perception that vaping is safe drives consumer behavior. RTHC-00218 showed that cannabis vapor activated cancer, inflammation, and oxidative stress genes in lung cells. This review puts that finding in clinical context: the gene expression changes aren't just laboratory curiosities—they align with emerging clinical evidence of vaping-related respiratory harm. For the millions switching from smoking to vaping, "less harmful" is not "harmless."
The numbers in context
Both methods: comparable acute increases in heart rate and blood pressure, altered lung immune responses. Vaping: reduced combustion toxicant exposure, clear EVALI association, increased respiratory symptoms. Long-term data: limited and inconclusive for vaping.
How the study worked
Narrative review of recent evidence comparing respiratory and cardiovascular effects of smoking vs. vaping cannabis. Published in Current Opinion in Pulmonary Medicine.
Who was studied
Review of evidence on health impacts of cannabis smoking and vaping.
What this study cannot tell us
Narrative review format limits comprehensiveness. Long-term vaping data simply doesn't exist yet. Cannabis vaping products vary enormously (flower vaporizers vs. oil cartridges vs. concentrates), and risk profiles may differ. EVALI was primarily linked to vitamin E acetate in illicit THC cartridges, which may not represent regulated products. Most studies don't distinguish between cannabis and nicotine vaping effects.
How to read the evidence
Narrative review in a specialty pulmonary journal—provides clinical perspective but limited by the early and incomplete evidence base for vaping.
When this study was published
Published in 2026, reviewing evidence as cannabis vaping becomes the dominant consumption method.
The bigger picture
This provides the clinical evidence review that contextualizes RTHC-00218's transcriptomic data. Together, they show cannabis vaping is biologically active in the lungs (gene expression) and clinically consequential (symptoms, EVALI, immune changes). The cardiovascular equivalence between smoking and vaping connects to RTHC-00167 and RTHC-00178's findings on cannabis and heart disease—the route of administration may not matter for cardiac risk.
Replication
Not stated in abstract.
Funding
Not reported in abstract.
Conflicts of interest
Not reported in abstract.
Questions still open
- Will long-term cannabis vaping data reveal the same COPD and cancer risks as smoking, or different ones? Does vaporization temperature matter for harm? Should harm reduction messaging promote non-inhalation routes (edibles, tinctures) over vaping?
Read the original research
Health impacts of cannabis: focus on smoking vs. vaping effects on the respiratory and cardiovascular systems.
Current opinion in pulmonary medicine, 32(2), 93-97
Current Opinion in Pulmonary Medicine is a reputable journal focusing on advancements in respiratory health.
Citation
Chaiton, Michael; Kundu, Anasua; Nathwani, Apsara Ali. (2026). Health impacts of cannabis: focus on smoking vs. vaping effects on the respiratory and cardiovascular systems.. Current opinion in pulmonary medicine, 32(2), 93-97. https://doi.org/10.1097/MCP.0000000000001239
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