Pneumonia cases linked to vaping are rising, and officials don't know why

Pneumonia cases linked to vaping are rising, and officials don't know why

Pneumonia cases linked to vaping are still rising. And federal officials don’t know what’s causing them

By HELEN BRANSWELL

STEVEN SENNE/AP

The Centers for Disease Control and Prevention reported a rising number of cases of mysterious pneumonias linked to vaping on Friday.

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