CDC: THC products linked to vaping-related lung injuries

What's happening: There are 805 confirmed and probable cases of lung injury and 12 dead associated with e-cigarette use in 46 states and 1 U.S. territory.

• The national study contained 514 patients, and 36% reported exclusive use of THC-containing products while 16% reported exclusive use of nicotine-containing products.
• Officials also cited a report from Illinois and Wisconsin which said that a vast majority of 89 people used THC products. The products were packaged, pre-filled cartridges and primarily acquired from "informal sources" like friends and family, illicit dealers or off the street.

Where it stands: The CDC and health officials still cannot identify a definite product or source. Acting FDA Commissioner Ned Sharpless told a congressional committee on Wednesday that investigators are working to identify the toxic products and "follow the supply chain to the source."

• "To be clear, if we determine that someone is manufacturing or distributing illicit, adulterated vaping products that caused illness and death for personal profit, we would consider that to be a criminal act," he said.

Go deeper: Revenue from marijuana vaping products dips 15% amid health fears