I have adult onset asthma and it kept me off my bike for years. I am just starting to ride again and I find that things go much better if I have taken Claritin in the morning as well as using flovent (this is for lung inflamation) I use albuterol before I ride and make sure I have it with me when I ride. So far, I haven't had to may issues. I live in VT so there is no way to avoid hills.

Robin
What I'm saying is using your meds help.