In this Tuesday, April 10, 2018 photo, Marshfield High School Principal Robert Keuther displays vaping devices that were confiscated from students in such places as restrooms or hallways at the school in Marshfield, Mass. Officials on Wednesday, August 21, 2019 said the Food and Drug Administration has joined the Centers for Disease Control and Prevention and a number of states in the investigation. of breathing illnesses among people who vape. Health officials are now looking into more than 150 possible cases in 16 states. (AP Photo/Steven Senne)

In this Tuesday, April 10, 2018 photo, Marshfield High School Principal Robert Keuther displays vaping devices that were confiscated from students in such places as restrooms or hallways at the school in Marshfield, Mass. Officials on Wednesday, August 21, 2019 said the Food and Drug Administration has joined the Centers for Disease Control and Prevention and a number of states in the investigation. of breathing illnesses among people who vape. Health officials are now looking into more than 150 possible cases in 16 states. (AP Photo/Steven Senne)

NEW YORK (AP) — The number of breathing illnesses reported among people who vape is growing. Health officials are now looking into more than 150 possible cases in 16 states.

Officials on Wednesday said the Food and Drug Administration has joined the Centers for Disease Control and Prevention and states investigating reports from the last two months.

All the illnesses were in teens or adults who had used an electronic cigarette or some other kind of vaping device. Doctors say the illnesses resemble an inhalation injury, with the lungs apparently reacting to a caustic substance. So far infectious diseases have been ruled out.

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No single vaping product or compound has been linked to all of the cases, and officials said it’s not clear if there’s a common cause.

No deaths have been reported.