Sprinting no longer deals oxygen damage unless you have lung damage or asthma. Sprinting is now based off of both halloss and oxyloss.
Lung damage now causes both oxygen damage and halloss when you sprint past your threshold.
Coughing disability now causes halloss when you sprint past your threshold.
Adds asthma, which causes oxygen damage when you sprint past your threshold, and inhibits your ability to recover from oxygen naturally. It also makes you cough harmlessly when you have more than 10 oxygen damage.