Please correct me if I am wrong, but I think washing clothes thoroughly in the washing machine can rid them of a smoking smell.
Does dry cleaning clothes also remove the smoker’s-smell?
Imho, I think that the smoker’s-smell would be a great deterrent to starting smoking.
Who wants to stand next to someone who smells like smoke, while he or she is davening?
The smell may interfere with a fellow Jew’s tefillah.