HUMBOLDT COUNTY, A new study claims that vaporizing cannabis cuts exposure to harmful inhaled byproducts by up to 99% compared to smoking a joint. The research points to combustion, not cannabis itself, as the real culprit behind toxic chemical exposure.

The study compared aerosol output from two vaporization devices against smoke from combusted joints, measuring 16 harmful or potentially harmful compounds, known in public health research as HPHCs. All three methods used the same batch of ground Lemon Cake Batter cannabis from Humboldt Farms, which kept the plant material consistent across every test.

The compounds measured included benzene, formaldehyde, and acetaldehyde. Nasty stuff. When cannabis burns, cannabinoids, terpenes, lipids, proteins, and carbohydrates all undergo thermal degradation and oxidation, generating particulate matter alongside volatile organic compounds, aromatic hydrocarbons, and nitrogen-containing compounds.

Vaporization sidesteps that process entirely. By heating cannabis below the combustion point, it releases cannabinoids and terpenes without triggering the chemical chain reactions that burning sets off.

“Combustion produces harmful byproducts, whether it’s tobacco, wood or cannabis,” said Richard Rucker, PAX’s director of product integrity and one of the study’s two researchers, in a press release. “By heating cannabis without burning it, vaporization significantly reduces the formation of these toxic compounds. It’s the same plant, but completely different exposure.”

Rucker conducted the research alongside Derek Shiokari, a senior chemist and data scientist at PAX. The pair tested PAX’s dry herb vaporization device, called the FLOW, and its oil vaporization device, called the TRIP, then compared the aerosol from each against joint smoke under matched puffing conditions.

The results were stark. Across all 16 measured compounds, vaporization reduced harmful byproducts by up to 99% compared to joint smoke. The paper found “dramatic reductions in key combustion markers including aromatic hydrocarbons and aldehydes.”

Still, the study comes with a significant caveat that readers shouldn’t overlook. PAX, the company that makes the vaporizers being tested, also funded and published the research. Rucker and Shiokari are both PAX employees. The paper does not appear to have gone through peer review at an independent scientific journal, at least not based on the information PAX released publicly.

That doesn’t automatically invalidate the findings. The methodology, using a consistent cannabis source and matched puffing conditions to isolate the combustion variable, is straightforward and defensible. But independent replication would go a long way toward cementing these numbers in the scientific literature.

The core finding, that combustion is the primary driver of toxic exposure during cannabis use, isn’t new or especially controversial among researchers. What PAX’s work adds is a specific quantified comparison using modern vaporization hardware, something the existing research on cannabis smoke toxicology hasn’t always done in rigorous head-to-head format.

For California consumers, the question of consumption method carries real weight. The state’s licensed cannabis market has seen vaporizer products grow as a share of total sales, with cartridge and disposable vape formats consistently ranking among the top-selling categories at dispensaries. But a meaningful slice of the market still buys flower and smokes it the old-fashioned way.

The Humboldt connection is a small but notable detail. Using cannabis sourced from Humboldt Farms grounds the study in product that mirrors what California consumers actually buy, rather than some controlled lab-produced material. Whether that batch represented the full range of commercially available flower is another question the study doesn’t address.

Rucker framed the research as a consumer information tool. “This research helps quantify the difference, giving consumers clearer information about how their choices impact exposure,” he said.

Reporting on the study was first picked up by Marijuana Moment.

The Department of Cannabis Control hasn’t issued guidance specifically addressing vaporization as a harm reduction method. State regulations focus primarily on product testing, licensing, and labeling rather than consumption method advisories. That’s not entirely surprising. Telling adults how to consume a legal product isn’t really the DCC’s lane.

But the data, industry-funded or not, is the kind of thing that could eventually factor into public health messaging from agencies like the California Department of Public Health, which does address cannabis consumption risks in its public communications.

For now, the study adds one more data point to a conversation that’s been building for years. Combustion is the problem. That’s not a new idea. But 99% is a number that’s hard to ignore.