OTOH, if he didn’t talk about it first, the media would trumpet it as if he were trying to hide his past. And he is not. However, he is not my choice for president. I would make him HHS secretary or Surgeon General.
He’s apparently discussed it in his book, but I suspect not all that many have read it. From what I’ve seen he’s a decent, well-intentioned man but like you I’m not all that certain that he’s the one for the Presidency. Certainly there’s a place for him in a conservative administration, though. HHS Secretary or Surgeon General, as you say.