A spa day. We all need one. It’s meant to relax and revitalize the body and mind, but what about the lungs? A new trend increasingly found at modern spas is halotherapy, or salt therapy—breathable salt particles intended to improve breathing. There has been news buzzing with the supposed benefits of salt therapy or halotherapy for lung conditions like COPD and asthma. But what exactly is salt therapy, and is it helpful or harmful?