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I can't exhale through my nose most of the year. I mean the same thing I wake up with every morning because I have to sleep with my mouth open in a poorly-heated room. Whatever it's called.I've also found that exhaling through the nose keeps that extremity thawed.
If by "sore throat" you mean getting sick later, I maintain a superstition that sickness is caused by microbes and not cold temperatures, despite evidence to the contrary.