Washington — Faced with a worsening epidemic of teenage vaping and a mysterious illness stalking users of cigarette alternatives, the Trump administration promised to ratchet up its oversight of a burgeoning but increasingly troubled industry.

President Donald Trump said Wednesday that vaping had become an urgent public-health concern in the US, “specifically with respect to children”. Health and human services secretary Alex Azar said that 5-million children say they have  vaped in 2019, a steep and startling jump from the 3.6-million who told government surveyors they had  used e-cigarettes in 2018.

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