There are 1,604 confirmed and probable cases of lung injury in 49 states and 34 deaths associated with e-cigarette use, the Centers for Disease and Control and Prevention announced Thursday.

The big picture: Additional patient lab tests have taken place related to a variety of vape products used. Little progress has been made in uncovering the specific cause of these respiratory illnesses, though CDC officials say that THC vape products have been linked to a majority of patients with vaping-related lung injuries.

  • The CDC’s investigation still has not identified any specific e-cigarette or vaping product or substance linked to all cases.

By the numbers, based on the latest information from 849 patients:

    • About 78% reported using THC-containing products, with or without nicotine-containing products; 31% reported exclusive use of THC-containing products.
    • About 70% of patients are male, about 80% of the patients are under 35 years old.