A casual conversation with someone I hardly know has raised this question in my mind: could running be responsible for someone 'getting' asthma when they have no history of it? Apparently the guy has recently returned to running after a considerable absence, but a few months into it he began with breathlessness & some tightening on the chest. A couple of weeks' rest gave no development nor improvement. Then he visited his GP who told him he had asthma. Any opinions? Is there a connection, or am I making 1+1 =3?