It certainly makes sense: COPD sufferers have varying degrees of serious breathing difficulties, which keeps them from almost any kind of exercise, especially in advanced stages. So maybe “lighter than air” air would be easier to breath, reduce shortness of breath and perhaps even allow them to do some exercise with all of its physical and mental benefits.
http://www.sciencedaily.com/releases/2004/11/041130075650.htm
‘Lighter Than Air’ Breathing More Than Doubles COPD Patients’ Exercise Endurance
