The difference between private and public reproof is how many people are aware.
Of all the things to get in trouble over, smoking is not the one I'd pick. Go for broke and question authority! Ask, "Hey! Where is that Armageddon anyway? The one I did not go to college because of? The one I pioneered for 5 long years for no pay, while struggling with a full time job? Or best of all, how about the witness husband, who never worked and slept around on me? I married as per the organization required? In the Lord, right?