Updated on Sept. 19 at 2:00 p.m. ET to reflect the latest information from federal agencies.
An outbreak of severe lung disease among users of electronic cigarettes continues to spread to new patients and states, and public health officials say it's too soon to point to a cause.
According to the latest report from the Centers for Disease Control and Prevention, a total of 530 confirmed and probable cases have been identified in 38 states and the U.S. Virgin Islands. The CDC has confirmed seven deaths, in six states.