Medicine + clean air. People with exercise-induced or regular asthma can use steroid inhalers (flovent) to reduce swelling, mucus, and "sensitivity" in the airways. Bronchodilators (ventolin) enlarge the diameter of the airways to help air flow and mucus come out of the lungs. Advair and symbicort (budesonide and formoterol) are good combination inhalers. Singulair chewables are another preventive medicine. Wearing a doctor's mask can filter air.