The schools that i went to did not allow their students to chew gum in school. According to their rules, it seems like chewing gum was like a contraband whose presence would result in immediate expulsion (exaggerated).
I carried around a full pack of cigarettes for the entire year after I gave up smoking. When anyone asked for a smoke I could just offer them one. That way I did not have to discuss my habit if I did not want to.
I always have two packets of ticktacks an empty one with a Uno reverse card in it and a filled one so when someone wants a ticktack I show them the empty one with the Uno reverse card so they have to give me a tiktak