[JohnFen]

> Many of my friends ended up becoming doctors, PAs, or nurses and medicine is basically all they talk about, especially the doctors.

Yes. It's the same with all of the engineers I know (and I suspect it's the same with all professions).

With my engineering friends, we had to set a rule that if we're at a social function that includes people not in our field, "talking shop" is expressly forbidden. This is to prevent a problem that had gotten out of control -- having a handful of people talking about arcane things that nobody else can understand, let alone are interested in.