Last spring, February I think it was, I was riding home from work and was using my mountain bike instead of my road bike. It was very cold and dry, about -5C. I tried to keep up with a roadie going up a few hills but eventually gave up. The cold air felt like it was going straight into my lungs and when I got home I had some kind of asthmatic attack and had trouble breathing. The attack lasted about 10 minutes and I eventually recovered. I have never had asthma previously or since. About two weeks later, I became very ill and thought it was some kind of virus. I was bedridden for 4 days and ,to make a long story short (x-ray, cat scan, broncoscopy), I was eventually diagnosed with pneumonia. It cleared up on its own but my lungs still gave me some problems and I did not cycle until July. I am fine now but wonder if any other riders have had a similar problem during the colder months.