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Well, looks like lpm got her answer. But one other thing that can cause this is pertussis, aka the good old whooping cough. Most of us got shots for it as kids, but I got it a few years ago anyway. We had a mini-epidemic in my area; I coughed for two months, and so did some of my friends. It went away on its own, but what helped was to breath warm air and yes, wear a muffler when going out into the cold. Cold, damp air would bring on a coughing fit in a jiffy.
But I also agree with LPM's doc; one thing that keeps a coughing fit going is, the continual irritation caused by, well, coughin; it can be recursive. If you can stop the coughing for a while, even with OTC remedies, you might break the cycle.
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