I was Diagnosed with exercise induced childhood Asthma when I was young. I have not had an "attack" in years, and do not even carry a rescue inhaler with me. However in the middle of week 2 of walking/jogging I sure wish I had one! I have been alternating running outside and on a treadmill, I feel that when on a treadmill I can focus on my breathing better. Deep, in through your nose, out through your mouth breaths really help me.
Good luck!!