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In the United States, federal, state and local agencies are investigating a rise in lung injuries.
In November, the U.S. centers for Disease Control and Prevention announced
that more than 2,000 cases of lung injuries, including 47 deaths, were connected to vaping.
The agency has identified vitamin E acetate, a liquid thickener, as a chemical of concern.
Vaping is the act of inhaling vapor through the mouth.
Vaping uses a battery-operated electronic device to heat and mix small particles with air.