Results from continuous irritation causes chronic inflammation of the trachea, lung and pulmonary artery (pulmonary vasculature) are important cells involved are T-lymphocyte (mostly. CD8 *), neutrophil and macrophage causes the secretion mediator of various kinds, including leukotriene B4, interleukin 8 and tumor necrosis factor, etc. There is also a process that was involved in the pathogenesis again two reasons for the increase of oxidative stress and lifestyle. The imbalance between proteinases with antiproteinases
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