Can you detect cigarette use as a doctor?

Sensitive nose and..: Often, the odor of cigarrette use is quite strong to a nonsmoker, but not so with the user. Thus a smoker may not think he smell, a nonsmoker-doc can easily senses that. Also, smokers often have stains on teeth and fingers where the cigarette is usually held. If u really want to hide, u can. Colonge, brushing/bleaching teeth, minty gums, and washing hands etc..Be good/healthy. Don't smoke.