Actors.

If you are writing a movie or a TV show and you write a character who (for whatever reason) smokes a lot, do me one big favor.

Cast someone who actually knows how to smoke a cigarette.

I don't care about the actor's resume or the way he or she looks. I'm immediately going to write off the actor or actress if I can tell that he or she is clearly not smoking.

I attend an extremely arts-based college, I can tell you that there is no shortage of talented artists who smoke. So not being able to find an actor who has experience smoking is a bad excuse.

I'm not even going to list examples. There are too many.