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Because urinary arsenic is a valid biomarker for integrating exposure from multiple sources [52], it is reasonable to speculate that subjects in villages with low arsenic levels in drinking water may also have been exposed, likely due to dietary intake, direct soil ingestion from cultivated agricultural products, and dust inhalation

When someone smokes for an extended period of time, the chemicals contained in cigarette smoke damage the air sac walls, thereby causing inflammation and tearing

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Source: BMJ 2011