Well, it depends how much you believe the medical profession. They did a big study with the aim of proving wrong, the "old wives tales" about going out and getting wet and cold, causing colds.
I never got the study, but I did cut out the newspaper study reporting that they were a bit miffed that the old wives were proven correct.
I know that if I get cold, and wet, and don't get dry and warm pretty quick, I can easily get a cold.
But then, we know I'm queer.