You probably have a viral upper respiratory infection but your cough is most likely also related to your
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Smoking hazards. Generally a cough caused by a cold lasts for several weeks. Smoking is a common cause of cough, especially if it persists. If this cough lasts longer than 30 days you should have a good evaluation that includes a chest x-ray. No matter what, you should quit smoking. Now would be a good time. You may want to look at our Quit Smoking Topic Center at http://www.nationaljewish.org/topic/smoking_cessation.html for ways to help you to quit smoking. Also check with your doctor for other quit smoking resources in your area.