In any case, if an actor isn't a pipe smoker in real life, you can tell right away: in the movie everyone always looks thoughtful or serious, or one of barely concealed superiority. Some then feign a nonchalance, a naturalness of gesture, which in reality they don't have, because it's clear that they don't know how to hold the pipe in their mouth.
I think I could find out (like many of you, I imagine), 9 times out of 10, no matter how good an actor is, whether he is a pipe smoker in real life or not.