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Among the evils of smoke are interference with sunlight, causing the most healthful rays of the sun to be filtered out and necessitating the use of artificial light; disfigurement of buildings, leaving deposits that are costly to remove and causing corrosion of stone and metalwork; destruction of plant life by shutting out sunlight and by clogging the stomata of leaves with oily deposits; and injury to the respiratory systems of humans and livestock.
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