Sorry to say, but that is absurd. I suppose you meant it to be that way however.

@desert: Your mother is wrong. What kind of doctor is she. I am not fabricating anything here. It has long been accented cold weather has nothing to do with sickness in higher academic and medical research circles. Might as well talk of foul vapours or alignment of planets... As for the trenches and foxholes example, first of all, I was referring more to WWII. Secondly, the disease that spread in trenches was anything but cold. Dysentery, diphtheria, pneumonia, Spanish flu, etc were definitely not rhinovirus.
Ehh, an oncologist, BUT THAT'S NOT IMPORTANT! The point is that being in the cold weakens immune systems.

And more time was spent in trenches in WWI anyway.