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Development of a Preclinical Inhalation Model to Test Vaporized Cannabis Distillates
Published on: May 30, 2025
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Polycyclic aromatic hydrocarbons and cannabinoids in secondhand cannabis smoke
Xiaochen Tang1, Abel S Huang2, Marion L Russell1
1Indoor Environment Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.
Environment International
|March 7, 2026
Summary
Secondhand cannabis smoke contains carcinogenic polycyclic aromatic hydrocarbons (PAHs). Exposure, especially from smoking, may pose cancer risks, exceeding safe levels in workplaces.
Area of Science:
- Environmental Health
- Public Health
- Toxicology
Background:
- Cannabis legalization increases exposure to secondhand smoke (SHS).
- Tobacco SHS has known health risks, necessitating assessment of cannabis SHS.
- Cannabis SHS contains cannabinoids, nicotine, and polycyclic aromatic hydrocarbons (PAHs).
Purpose of the Study:
- To measure concentrations of key compounds in cannabis SHS.
- To compare cannabis SHS with tobacco SHS and exhaled cannabis aerosols.
- To evaluate potential health risks, including cancer risk, from cannabis SHS exposure.
Main Methods:
- Air samples collected in public cannabis consumption venues.
- Analysis of cannabinoids, nicotine, and PAHs in air samples.
- Comparison with exhaled cannabis aerosols and tobacco SHS.
Main Results:
- Cannabis SHS contained Tetrahydrocannabinol (THC) below psychoactive levels and low nicotine.
- Total PAH concentrations varied by location, with benz[a]anthracene (B[a]A) being prominent.
- PAH levels in cannabis SHS, particularly from smoking, indicated potential cancer risk exceeding workplace safety thresholds.
Conclusions:
- Cannabis smoking and vaping produce aerosols containing carcinogenic PAHs.
- Inhaling secondhand cannabis aerosols leads to exposure to carcinogens.
- Workplace exposure to SHS from cannabis smoking may pose significant cancer risks.
Keywords:
AerosolBenz[a]anthracene (B[a]A)Cancer RiskCannabidiol (CBD)Cannabinol (CBN)Cannabis DispensaryEnvironmental Cannabis SmokePolycyclic AromaticHydrocabons (PAHs)SmokingTetrahydrocannabinol (THC)VapingMore Related Videos
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