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“Significant increases in airway responsiveness to histamine (tenfold fall in PC20 FEV1) were documented 7 hours after exposure for 5 minutes to red cedar while baseline spirometry remained unchanged.”
The Journal of allergy and clinical immunology • 1986 | View Paper
“Bronchial reactivity to inhaled histamine increased significantly after exposure to red cedar in the laboraotry and again after natural exposure to red cedar at work.”