As cannabis legalization continues to expand globally, researchers are increasingly investigating both the therapeutic potential and the health effects of inhaled cannabis. While cannabinoids such as THC and CBD are being explored for numerous medical applications, inhalation remains the most common route of recreational cannabis use, making it essential to develop preclinical models that closely replicate human exposure.
A standardized nose-only inhalation model provides researchers with a clinically relevant method for studying the cardiovascular, pulmonary, neurological, and behavioral effects of cannabis smoke or vapor. By delivering controlled, reproducible aerosol exposures, these models improve translational relevance and help researchers better understand the consequences of both acute and chronic cannabis inhalation.
A study published in Inhalation Toxicology developed a novel mouse model of nose-only inhaled vaporized cannabis, enabling researchers to investigate the neuroradiological, behavioral, and physiological effects of cannabis exposure in a controlled setting¹.
The investigators selected inhalation as the route of administration because it most closely mimics human cannabis consumption. Compared with intravenous or intraperitoneal administration, inhalation produces distinct pharmacokinetic and behavioral responses that better reflect real-world use².
Male C57BL/6 mice were exposed to Cannabis sativa (10.3% THC, 0.05% CBD) during three exposure sessions over four weeks using the SCIREQ inExpose™ nose-only inhalation exposure system. Exposure sessions were separated by at least 72 hours to evaluate acute physiological responses.
Cannabis was aerosolized using a Volcano® vaporizer, providing consistent vapor generation with precise temperature control. A 450 mg cannabis load produced target plasma THC concentrations between 75 and 165 ng/mL, allowing reproducible dosing across experimental animals.
Immediately following exposure, researchers evaluated locomotor activity and anxiety-like behavior using an open field maze.
Mice demonstrated an increased avoidance of the center of the arena after acute cannabis inhalation, suggesting an anxiogenic response. These findings illustrate how controlled inhalation models can be used to investigate the behavioral effects of inhaled cannabinoids and their underlying neurobiology.
Cardiovascular parameters were measured non-invasively using tail-cuff blood pressure monitoring before and after each exposure.
Following cannabis inhalation, mice exhibited:
These acute cardiovascular responses demonstrate the importance of standardized inhalation exposure systems for investigating cannabis-related cardiovascular physiology and potential health risks.
To examine neurological effects, researchers performed blood oxygenation level-dependent (BOLD) functional magnetic resonance imaging (fMRI) immediately after cannabis exposure.
Using an MRI-compatible exposure configuration that reproduced the inhalation profile used with the inExpose system, investigators observed:
These findings demonstrate how controlled inhalation exposure models can be integrated with advanced neuroimaging techniques to investigate the effects of inhaled cannabis on brain function.
As cannabis use continues to evolve through both recreational legalization and medical applications, reproducible inhalation exposure models have become increasingly important. Standardized systems allow researchers to generate clinically relevant exposure profiles while improving reproducibility between studies.
The inExpose™ enables controlled nose-only aerosol exposure, making it well suited for studying inhaled cannabis, nicotine, vaping products, environmental aerosols, and inhaled therapeutics. Combined with physiological, behavioral, imaging, and molecular endpoints, these models help researchers better understand how inhaled substances affect multiple organ systems.
As research expands beyond acute exposure to include chronic use, varying cannabinoid formulations, and commercially available cannabis products, standardized inhalation platforms will continue to play an essential role in advancing translational respiratory and neuroscience research.
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