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1) THE MERCK MANUAL--Home Edition, Sec. 4, Ch. 38, Occupational Lung Diseases: Occupational lung diseases are caused by harmful particles, mists, vapors, or gases inhaled while a person works. Where in the airways or lungs an inhaled substance ends up and what type of lung disease develops depend on the size and kind of particles inhaled. Larger particles may get trapped in the nose or large airways, but the smallest ones reach the lungs. There, some particles dissolve and may be absorbed into the bloodstream; most solid particles that don't dissolve are removed by the body's defenses.

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