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First, the body makes you cough, trying to dislodge the item. Coughing will continue, but the body also begins to "fight" the item as an invader. It tries to wall it off. This activity triggers mucous to collect aaround the item, which can increase coughing. If coughing dislodges the item, the body's defenses stand down, but macrophages still do clean up afterward.

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