A friend of mine mentioned that she goes to a pulmonologist at a Johns Hopkins University to me. He said that every time he goes, they have cups of Mountain Dew lined up, and the doctor encourages the asthmatics there to drink the Mountain Dew. There is some research being done about Mountain Dew possibly relieving some asthma symptoms...it has something to do with the caffeine I think. I just thought I'd share that with you all. Sounds interesting.
Edit: I looked this up on the internet and it did say that in the old days, when you had an asthma attack, they'd brew you a strong cup of coffee. (Actually, this kind of works for me if I inhale the steam from it) Caffeine has been proven to help bronchoconstriction. However, Mountain Dew contains tartrazine, and it's been estimated that 50,000-100,000 Americans are sensitive to it. So I'd think that Mountain Dew would cause asthma attacks, not relieve them.
I don't know.