Call For Phillip Morris

I saw The Monuments Men over the weekend. The critics are right, it's not much.  But what fascinated me was how it got its rating.

Here's the exact wording, direct from the MPAA: 

Rated PG-13: For some images of war violence and historical smoking.

Now there was plenty of smoking in the movie--about as much as there was in World War II.  There was even a scene or two build around smoking.  But I didn't realize smoking got you a PG-13. Even better, "historical smoking"?  Is that different from how people smoke today?  Older brands?  In restaurants?  More proudly?

(Two more questions.  Do actors still like parts where they smoke because it looks cool?  Do actors who smoke like to get parts where they smoke so they have an excuse?)