We all know we shouldn't smoke, so we don't need our doctors telling us not to, right? Or we think, "I only smoke when I drink, so it's not a big deal." Well, it doesn't matter what you tell your doctor, because as soon as she examines you, she'll know you smoke since nicotine stains the inside of your nose. Smoking causes premature wrinkling, asthma, and lung cancer, and it also raises your risk for stroke when using birth control pills, so women need to be truthful with their doctors about this one. Do you lie about how much you smoke?