There is nothing worse than a smoker justifying and trying to convince you to allow smoking in your home/car. As a casual smoker myself, it makes me realize really fast how shitty people can be when they don't get their way.  My favorite line is when they sit there and basically scream at you 'it doesn't even smell!'  Then they get all huffy because you don't want your home/car to smell like smoke. Fuck those people. 