Researchers have discovered a link between chronic obstructive pulmonary disease (COPD) and the immune system.

According to a study published in the American Journal of Respiratory Critical Care Medicine, dendritic cells, which increase immune activity, may play a key role in the development of COPD.

“We found that dendritic cells, a type of immune cell that initiates immune responses, are in the lung interacting with lymphocytes, and that these dendritic cells seem to get more active as the disease goes on,” senior author Dr. Jeffrey Curtis explained.

Curtis also noted that if doctors can stop the cells’ activity, it has the potential to stop the disease from progressing further.

COPD is common among smokers and is usually found in patients with bronchitis, emphysema, or both. According to the study, most people who have COPD already sustain severe lung damage before symptoms start to appear. Antioxidants found in may help ease COPD conditions. It is also a good idea to stay away from greasy foods or meals that are high in saturated fat.