Nearly all vape cartridges seized from illegal shops in Los Angeles last December were found to be diluted with undisclosed additives, some known to be harmful, according to California officials.

The findings are troubling on two fronts: one, it won’t get you that high. Almost all samples tested turned out to be labeled with incorrect THC potency, sometimes at levels equal to or less than that of cannabis flower.

For instance, one cartridge claimed it contained 85% THC, but tested at only 33%. Some came in as low as 18% THC.

What’s potentially much worse than the lack of THC is what it’s being replaced with. 75% of samples were found to contain “undisclosed additives.”

Hard to say if something’s scary just because it’s undisclosed. What is frightening is that, among the additives discovered was vitamin E, the same thickening agent implicated in last year’s rash of severe respiratory illnesses and fatalities related to vaping.

The findings are understandably of concern to California officials, who are trying to get their arms around a cannabis market where spending in the black market still outnumbers that in the legal market 3 to 1.“The prevalence of dirty and dangerous vape pens at unlicensed cannabis stores demonstrate how important it is for consumers to purchase cannabis goods from licensed retailers, which are required to sell products that meet state testing and labeling standards,” said Lori Ajax, head of California’s Bureau of Cannabis Control