I run/bike through the winter here (we have pretty mild winters with temps rarely falling below -10°C). On especially cold days I do notice that I cough a lot a

I run/bike through the winter here (we have pretty mild winters with temps rarely falling below -10°C). On especially cold days I do notice that I cough a lot after exercising but normally its not enough of an issue to actively do something about it. Would be interesting if there was some hard research about the levels and durations required to do lasting damage.