Unlike neutrophils, which lives for only a few days, mature macrophages live in the body’s tissues for months, perhaps even years. Some act as janitors, sweeping up dirt, damaged tissue, and aged cells. Each day, the macrophages in a single human body consume more than 300 billions dead or dying red blood cells.
In the lungs, macrophages continuously clean the surfaces of the air sacs, mopping up the bits and pieces matter that find their way past the nostril hairs and cilia of the respiratory tract. As long as they do not have to cope with additional smoke pollution, macrophages can eventually restore the lung’s normal appearance.
Therefore, it is never too late to quit smoking.
AMAZING ISN’T IT?