Yes, the humidity bothers me, but I find that I can acclimate myself to it by doing shorter rides and making sure I am well hydrated. I used to totally stay indoors for exercise on these "bad air" days, but I do much better now. Two weeks ago I did a 35 mile ride on a 96 degree day with high humidity. The pace was slower than my usual, though.
Who said it can't be asthma without wheezing? Both myself and my son have had asthma without wheezing. I believe my doctor called it "specious" asthma. But, my asthma is transient. It rarely bothers me. It's mostly allergy induced or comes on when I have some other thing developing. I keep a Ventolin inhaler just in case, but i go for months without using it. I took Q Var for awhile 2 years ago, but only after having bronchitis. Advair scared me, although it has helped several people on this list.