A lot of research and testing went into the formulating of this blend. We have quite a few customers with allergy and asthma issues. Asthma, in particular, requires a more gentle touch so that the automatic strong cough reflex is not elicited, which can happen with some cold and flu type blends. We believe and have found that this blend works effectively to calm the cough reflex and the tight feeling of inflamed and irritated lungs. I remember quite clearly my experience with this blend after running what seemed like forever in the Denver airport to catch a short connection. We ran from one gate to another and we were both out of shape. By the time we made it to our seats, the flight had been waiting on us (surprisingly enough) and the air was stagnant in the cabin of the plane. My chest hurt from the over-exertion and I truly could not take a deep breath. I was coughing uncontrollably and was seriously about to grab for the oxygen bag. I remembered that I had the Breathe Easy in my purse and grabbed for it, just opened the bottle and felt immediate relief. True story. If you are familiar with Young Living blends - this is much like their RC blend, but much more reasonably priced with unadulterated or undiluted oils.