Hi, running outside or inside on a treadmill 80's or 50s does't seem to matter I cough alot. I get pretty phlemy. I do not smoke nor have I ever, I do no drugs I do not drink. I have no stds, I went to the doctor and asked they said well your lungs sound nice and clear I dont think you have asthma maybe allergies. I tried a prescription allergy med for a few weeks did nothing for me still cough. I know I sure wouldn't want to run near someone coughing. its not like a sickly cough its justa cough to clear my throat I guess I cough swallow good to go for 30 seconds. 30 seconds later same thing. mostly just run on the treadmill 6-8 mph for 30 minutes within another 2 weeks I hope to be able to do teh whole thing at 8 mph. I am chubby maybe just a fat person cough? I searched around a little I saw someone else saying they cough when they are dong doing long distnace running I just start running and I start coughing right off.