At a local production of Forbidden Broadway they say something like
"Smoking, much like spontaneous combustion, is not permitted. Should you have to do either because of religious reasons, we ask that you do so quietly.
Also, should a fire go off, please exit the theatre in a calm manner, while everyone else is screaming in panic. But remember, the last one out gets to finish all of the leftover drinks!"
Always great.
Theatre is a safe place to do the unsafe things that need to be done.
-John Patrick Shanley