COPD & Emphysema Support Group
COPD is a progressive disease characterized by airflow obstruction or limitation. Emphysema is characterized by loss of elasticity of the lung tissue, destruction of structures supporting the alveoli and of capillaries feeding the alveoli. Both have symptoms that include shortness of breath, among other respiratory troubles. If you are a COPD or Emphysema sufferer, join...
http://www.buzzle.com/articles/oxygen-therapy-side-effects.ht
There is a few links about this on internet search, below a few that may be of help for you.
Increased blood oxidative stress in amphetamine users.
http://www.ncbi.nlm.nih.gov/pubmed/19799584
Supplemental Oxygen Prevents Exercise-induced Oxidative Stress in Muscle-wasted Patients with Chronic Obstructive Pulmonary Disease
http://ajrccm.atsjournals.org/content/173/10/1122.short
A pdf document on Oxygen and oxidative stress :
http://www.mediafire.com/?yt75n25b699kjvn
What is Oxidative Stress:
http://www.news-medical.net/health/What-is-Oxidative-Stress.aspx
Understanding Oxidative Stress and the role of anti oxidants:
http://www.preventive-health-guide.com/oxidative-stress.html
There is even a wiki page on it.
Hope you find something of use.