New research shows that 40.5% of high-school seniors have tried nicotine vaping, adding urgency to President Trump’s announcement that the Food and Drug Administration (FDA) will take action to ban the e-cigarette flavorings that have proved so attractive to teens and young adults. Meanwhile, federal health agencies are encouraging physicians to report detailed information on cases of vaping-associated lung illnesses. Here’s what doctors need to know.

My lede. The whole shebang.