@brenjaco I have allergic asthma and the best thing I can do is control the allergies with shots, antihistamines, avoidance of triggers, etc. I start exercise slowly and stop if I need an inhaler. Using generic Mucinex helps a lot too to thin mucous so it can be expelled before it becomes trapped and causes trouble. I do have a preventative inhaler that reduces an immune response to things that trigger allergies, Qvar, which is an inhaled steroid and a rescue inhaler Xopenex (generic Albuterol) which does raise my heart rate if I get too much. I use Qvar before exposure like when I will be in public. At my home, I use HEPA air filters, so things are more controlled and less issues. Even cough drops help open up my airways. Always check with your doctor on medication effects, but you can help your situation with your immediate environment. I know cold air is a problem if I am breathing hard with exercise. Even food allergies can trigger my asthma and phlegm, so I have figured out what to avoid.