Federal regulators have opened a criminal probe into e-cigarette-related lung illnesses in the United States.
There were seven deaths and 530 confirmed or suspected cases of serious illness related to vaping by late Thursday.
The Food and Drug Administration says it has no intention of prosecuting e-cigarette users, but says its criminal investigations division can help federal authorities figure out why people are getting sick.
The Centers for Disease Control and Prevention is urging people to stop vaping. But it says no one should go back to smoking tobacco cigarettes, urging smokers to get counseling or use FDA-approved products to stop smoking.
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