Ok, that book linked above says:
Mouth breathing... may result in cold irritation to the mouth, pharynx, trachea, and even bronchi when the air temp is below -12C (10F).
I may have gulped in too much cold air, my chest feels a little funny (almost like i've been coughing a lot, but not as sharp a pain) and my throat feels the slightest bit sore when i swallow. I was breathing really heavily in 0F temps (-18C) friday night, helping a guy push his car off the street. I only had a thin fleece scarf over my face, so it wasn't doing much to warm the air. How long before this goes away? any suggestions to take care of it?