Originally Posted by Mr. Underbridge

I have fairly light exercise-induced asthma. Generally kicks in if I do something dumb like sprints before warming up. Generally worse in cold weather.

If yours is also worse in the cold - like many people's asthma - you might benefit from a balaclava if you're not already using one. I saw a well-done study (can't remember where or I'd cite it) that showed that it's not cold weather that inflames asthma - it's the dry air that generally associates with cold weather. Using a balaclava traps a layer of moist, warm air near your nose/mouth, which should help a lot.

Good luck!