I smoke in mine, but I always have the window half down with the cigarette by the cracked window and I'm super careful how I flick it so all the ashes don't come back in lol. I always rub the headliner by the back of the window with a damp towel when I wash it and vaccuum it often. My car never smells like smoke inside. I'm the only one allowed to smoke in it and you'd never know I do.