It means he thinks you are lovely. that's a beautiful compliment, but it doesnt necessarily have to mean more than that. It means he secretly likes you and doesn't have the courage to tell you that he likes you to your face. could just be flirting to see what you're reaction would be like.
Medical air is also used during anesthesia as a substitute for nitrous oxide to reduce the high concentration of oxygen exposure. While the source of medical air may be a manifold with a bank of compressed air cylinders, most hospitals use a compressor system. This article will refer to installations with air compressors. An illustration of a typical medical air plant is provided for your reference throughout this article's discussion.
They are used to prevent asthma like symptoms all day. Then there are your rescue inhalers like combivent, albuterol, atrovent, xopenex..... These are meant to be used during an asthma attack hence the title rescue inhalers. They relieve the airway constriction. There is also a pulmicort inhaler which is a steroid. This is used to relieve the inflammation of your airway. Do they dry up the moisture in your lungs? Not that I am aware of Does it raise your adrenaline?