Vitamin E acetate, an additive used in black market vaping products, is the probable culprit in the recent spate of vaping-related illnesses and deaths, according to the US Centers for Disease Control and Prevention (CDC).

CDC investigators tested fluid from the lungs of 29 patients across the country who had gotten sick or died after vaping, and all contained vitamin E acetate, the Washington Post reported.

No other potential toxins were detected. The CDC continues to recommend that consumers avoid all vaping and e-cigarette products. Ohio also announced a ban on vitamin E acetate in vaping products.