How Cannabis Vapor Impacts Lung Health: What We Learn from Advanced Research Models
As cannabis consumption increases, so does the popularity of products marketed as safer alternatives to traditional smoking. One of the most popular is the dry herb vaporizer, a device that heats cannabis flower to release cannabinoids for inhalation without combustion.
But how safe are these smokeless products for your respiratory system?
In a recent study, Wilson et al. (2025) examined the effects of dry herb cannabis vapor on lung epithelial cells, the first line of defense in our respiratory tract. Understanding the health impacts of these products is crucial, but as the study highlights, the way scientists research them is equally important.
The Challenge of Inhalation Toxicology: Submerged vs. ALI Cultures
Traditionally, inhalation toxicologists have relied on submerged cell cultures, where lung cells are grown in a petri dish completely covered with liquid nutrient media. However, this does not reflect human anatomy. In real lungs, epithelial cells are exposed to air on one side and receive nutrients from the bloodstream on the other.
To create a more physiologically relevant environment, researchers developed Air-Liquid Interface (ALI) cultures. In an ALI model, cells grow on a porous membrane with liquid media beneath them and direct air exposure above them.
Historically, studying complex inhaled materials like smoke or vapor required creating liquid extracts (usually bubbling the vapor through an ethanolic solvent) to apply to submerged cells. While this captures certain compounds, it diminishes bioavailability and introduces artificial solvent effects.
To find out, the study compared three models of cannabis vapor exposure:
- Submerged cultures treated with a cannabis vapor extract
- ALI cultures treated with a cannabis vapor extract (termed pseudo-ALI)
- ALI cultures treated with whole cannabis vapor using the expoCube™ system
Key Findings: Is Cannabis Vapor Safe for Lungs?
The study revealed crucial insights into both inhalation research methodology and the actual biological impact of cannabis vapor:
ALI models represent real lungs better: Even when using a standard lab cell line (A549), cells grown in an Air-Liquid Interface showed increased activity in genes responsible for surfactant production, ion transport, and barrier integrity.
Submerged cultures exaggerate inflammation: Submerged cells exhibited a much stronger inflammatory response to the cannabis extract. This is likely because liquid-covered cells cannot produce surfactant, a natural fluid that protects real lung cells from environmental damage.
Cannabis vapor triggers stress pathways: When true ALI cultures were exposed to whole cannabis vapor using the expoCube™ system, researchers observed the activation of pathways related to oxidative stress, metabolism, and cell cycle regulation.
Potential long-term risks: Across all three testing models, the disruption of these cellular processes indicates that cannabis vapor could potentially create a pro-carcinogenic environment in the lungs.
Moving Forward: The Importance of the Right Testing Tools
This research drives home two critical takeaways. First, whole-vapor ALI exposure models are vastly superior to liquid extracts for studying inhaled substances, as solvents can introduce “vehicle effects” that obscure true results.
Second, with new vaping and dry herb products constantly entering the market, “smokeless” does not automatically mean harmless. It is vital for researchers and toxicologists to utilize advanced exposure tools, like the expoCube™, to accurately assess respiratory risks and guide evidence-based public health policies.
Reference
Wilson et al (2025) Transcriptomic changes in oxidative stress, immunity, and cancer pathways caused by cannabis vapor on alveolar epithelial cells https://doi.org/10.1007/s10565-025-09997-3
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