My thoughts as well. There are so many wives tales about this in all parts of the globe. While its true freezing temperatures do harm and can kill- cold air should not make one sick, throw up, etc.
It is common in parts of Asia, that if you leave the window open the person can get ill. lol
You can get in trouble, if you leave the door open too long in the winter, and God help you if someone starts to sneeze because you will be blamed! ( I have before )
Why did the Creator make snow? And how would eskimoes survive? What about all the land which is constantly cold and full of people?