I used to let my pals smoke in the kitchen with the windows open, well before I had DS. I rented out my flat a few years ago on the basis the tenants never smoked in the flat. They were cool with it and I kind of made it a bigger deal as DS would come back to flat if need be (moved in with DP) Anyhow, they bailed. They smoked in my place. Whole place is honking. I have to replace every carpet and paint every wall. Super pissed off as they knew DS would come back. Twunts. So IMO I would never let anyone smoke in my place again. Honestly it isn't worth it. The smell clings to everything....