Whether the inhaled dust can be expelled depends mainly on the normal immune function of the body’s lungs and the amount of inhaled dust. If the amount of inhaled dust is small and the body’s lung function is normal, the inhaled dust can be continuously expelled from the body through the immune response of the lungs, such as the appearance of increased mucus and the movement of cilia on the walls of the lungs and bronchi. If there is more inhaled dust, long-term exposure, and poor lung function, it can easily cause pneumoconiosis. This is when there may be excessive accumulation of dust in the lungs, leading to varying degrees of fibrosis, calcification, and even a combination of infections from other pathogens, such as bacterial pneumonia, tuberculosis, etc.