Cigarette smoke is not only harmful, it can leave bad odors lingering for weeks. If want to kill the stale odor of cigarette smoke in your car, don't use an air freshener. The chemicals in commercial air fresheners can cause irritation to your skin, eyes and respiratory system and cover up odors rather than removing them. Follow these easy steps to find out how to get rid of cigarette smoke odor the cheap and eco-friendly way.