For the first time since the outbreak of lung illnesses associated with e-cigarettes earlier this year, the Centers for Disease Control says it has identified a specific ingredient as a "very strong culprit": Vitamin E acetate.

Swiftly on the heels of incendiary national news stories about the growing number of cases of serious vaping-related lung illnesses, the FDA issued a warning letter to SF-based Juul Labs saying the company has already violated federal regulations with its marketing claims.

Some 200 people have come down with serious respiratory illnesses in recent months that are linked to street-purchased vape products. The CDC has now taken the unusual step of issuing a warning about vaping, despite there being no single product that's been identified as the culprit.