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first question: do you smoke? if so, it might be tar or some of the other bajillion cruddy ingredients in smokes
second: might be a low-grade, chronic infection or post-nasal drip... but, like someone else said, (don't feel like looking to see who said it) go see your doc and find out for sure whether it's something that needs treatment and/or if something can be done to get rid of it for you.
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