As a day checker you work under other's rules, so play by them. Talk, talk, talk is all part of the daily work place. Many performers in the make-up chair want to use this time for medita tion or mental line rehearsal. Maybe that performer doesn't want to share your life or need your personal counseling. Smoking is a personal habit, so I am only going to offer my observations.
Fewer people are smoking, so the habit is more obvious.
Smoking diverts creativity and energy, and it becomes the train of thought. With the red stage lights flashing, the cigarette circle is caught outside when the work is inside. Also, consider the nicotine odor on your clothes, hands and breath. It can't be eliminated, only masked because nicotine permeates. If you have discussed the potential of upcoming work on a show, have the courtesy to check back with the make-up supervisor before accepting another offer.