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People who work at microwave popcorn factories may develop a lung disease called bronchiolitis obliterans if they work in areas that contain high amounts of butter flavoring in the air. These areas include the area where popcorn flavorings are mixed and the area where the popcorn is packaged.

People who work in microwave popcorn factories are at risk for developing a lung disease called bronchiolitis obliterans, especially if they work in the mixing room or the microwave popcorn packaging area. Some workers may have a mild form of the disease that does not cause symptoms. However, most lung diseases are chronic and progressive and usually get worse.