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Increases in protein leak across the alveolar-capillary barrier after exposure of mice to waterpipe or cigarette smoke. Mice were exposed to either waterpipe or cigarette smoke (WBE, 1 h daily for 7 days). Both cigarette and waterpipe smoke exposure resulted in elevation of total BALF proteins. *Significant difference from the control group (P < 0.01, n = 8).
