Hi, for the last week, my lungs feel cold when inhaling. I don t feel sick (no common cold, pneumonia, asthma, fever, etc). I haven t been exercising outside in cold weather. I have no difficulty breathing. It doesn t hurt nor feel uncomfortable. Actually, it feels kind of refreshing, as if my airways are dilated somehow. But it just feels odd and I m wondering what is happening and if I should see my doctor?