Plus, not to get all LinkedIn about it, but think of all the lost networking. The jobs, the phone numbers shared, the “Oh, you know ****? I worked with her for years”. Revealing oneself as a smoker sheds a level of professionalism and invites someone in. They make a big joke of it with a season five episode of Friends, “The One Where Rachel Smokes”, but it’s a tried and true method of bonding, even to this day.