A new pilot study from California NORML suggests that cannabis vape pens may result in significantly lower exposure to several harmful substances than smoking pre-rolls. The study compared two vape products from California’s licensed market with pre-rolled joints from a dispensary in San Diego. The results showed that the vape products produced cleaner emissions in almost every tested category, although the researchers stress that more research is needed.
Two vape products were compared with pre-rolls
The study was carried out as a laboratory test using a machine that simulates puffs. Researchers tested one disposable product with “live rosin” and 83 percent THC, one reusable 510 cartridge with “live rosin” and 86 percent THC, and half-gram pre-rolls with 23 percent THC. The samples were analyzed for cannabinoids and a number of substances often linked to smoking-related health risks, including volatile organic compounds, carbonyl compounds, and heavy metals.
According to the report, the vape products produced significantly lower emissions per puff than the joint in almost all categories. Benzene and acrolein, two particularly harmful substances, were detected in the joint but not in the vape products. For formaldehyde, however, the difference was smaller than in some earlier comparisons, with a reduction of around 40–50 percent.
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More THC per puff, but dosage is difficult to predict
The vape products delivered more THC per puff than the joint in the test. The disposable pod produced 3.2 milligrams of THC per puff, the cartridge model 5.7 milligrams, and the joint 2.6 milligrams. However, the researchers warn that the THC content of a product cannot be directly translated into the actual dose, since emissions from vape products are affected by temperature, airflow, clogging, and how the device is used.
Heavy metals stood out as a risk area
The clearest drawback in the test concerned the heavy metals nickel and chromium, where the vape products produced higher levels than the joint. The report links this to heating coils in some vape devices, particularly components that may contain nichrome. Joints, on the other hand, produced higher levels of lead and cadmium, substances that cannabis plants can absorb from soil.
The researchers estimated daily exposure based on the assumption that a regular user takes 22 puffs per day. The vape products stayed within applicable limits from the U.S. EPA/RIC-IRIS, while the joint did not. At the same time, the nickel levels in the cartridge model came close to California’s stricter OEHHA limits for chronic exposure.
Researchers call for standards and more testing
The report describes vape pens as a possible technology for reducing harms linked to smoking, but not as risk-free products. The researchers call for more studies on higher temperatures, “dry hits,” different concentrates, additives, differences between devices, heavy metals, secondhand exposure, and recycling of cartridges, batteries, and other e-waste.
Because the study only included two vape products and one pre-roll product, the results should be seen as preliminary. The market contains many different devices, oils, temperature settings, and material choices. The conclusion is therefore not that all vape products are safe, but that controlled vaporization in the tested products produced significantly lower emissions of several smoke-related toxins than combustion.
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