It's natural: When running your breathing rate increases, which can be very drying to the airways. Increased phlegm production is a completely natural way to counteract this drying, even though in the winter outside it can be really annoying. My advice (as gross as it is) is to get good at spitting and snot rockets. Or wash your gloves often - that's what i do! good luck.
Answered 1/16/2014
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