[PBS NewsHour]

WATCH: Researchers Still Striving to Understand Cause of Vaping-related Illnesses

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State governments continue to crack down on flavored e-cigarettes and other vape products, largely in response to the deaths and illnesses that began coming to light this past summer.

But as lawmakers deliberate over their policy response to vaping, researchers are still trying to understand the cause of the illnesses.

NewsHour science correspondent Miles O’Brien reports.