I don't smoke and one of my house rules is you don't smoke in my house. A friend who I haven't seen in a good couple of months turned up on my door step a couple of weeks ago - puffing away on a cigarette. My 7 year old answered the door and said: 'Mum won't let you in while you have that.' (meaninig her cigarette. She responded by saying: 'Well, let's see what Mum says.' When I got to the door I politely explained that I didn't mind her smoking outside as long as she disposed properly of her cigarette but she was not to come in with it.
She got in a right huff and called me a snob and stormed off!