The simplest solution for how to get cigarette smell out of your nose, is to blow your nose. It is likely that smoke particles are lodged in mucus and thus blowing your nose should help you to remove the smell. If you notice the nasty odor lingering, rinse your nose with a saline solution. Obviously, you also need to treat the root of the problem, so be sure to use air fresheners in your home and car and clean any areas where you may be able to smell smoke hanging about.