In regards to the HPV, I had a recent PAP test as part of a presurgury checkup. It came back fine. I recall specifically asking the nurse on the phone who said the test was fine if this meant I did not have HPV. She said that you do not have HPV if your PAP tests are fine. I'm assuming that I can believe that information, but I'll make a point to discuss HPV again at my next PAP smear.
I've been wondering about other factors, like breathing cleaning agents or using nasal steriods for allergies or overdoing it using the artifical sweeteners.