My "hang 'em, shot 'em" attitude will never be seen by pax.
Don't bank on it.
When I fly anywhere on a commercial flight I am a passenger.
How do you know that someone who sneaks off to break the No Smoking rule once isn't going to do it again later in the flight with possible disastrous consequences? These days there is a plethora of anti-smoking medication available and it shouldn't be beyond the capability of someone with normal intelligence to obtain some prior to the flight.