You might want to consider supplementing with MSM.

"MSM has been found to enhance the process of cell renewal, facilitating the production of healthy and flexible cells...insufficient levels of MSM directly inhibit the body?s ability to repair and replace damaged tissues, leading to an accumulation of dysfunctional cells and a weakened state of health which contributes to an increased susceptibility to illness and disease." In addition, "MSM has been documented as a promising treatment for numerous health problems, including allergies, asthma,...emphysema, some vascular conditions, and wound healing (especially when taken along with vitamin C)." Furthermore, "preliminary studies suggest MSM can assist in the treatment of lung dysfunction and other respiratory diseases...."
(Source: HART Master Reference, Copyright 1997-2003)

I hope you'll find this information helpful.