4. “It never comes up where they source it. You don’t ask.”

That was a 17-year-old who was one of 400 people hospitalized across the U.S. for vaping-related lung illness. As the authorities work to understand the cause, a small-town drug bust offers a closer look at the vast black market for vaping supplies.

In other public health news, five weeks before a landmark trial in the opioid epidemic, the defendants argued in court that the judge overseeing it was biased.

And in case you missed it, prosecutors traced about $1 billion in wire transfers by the Sackler family as it faced a raft of lawsuits over its role in the opioid crisis.