CCL4 and chronic bronchitis: Significantly increased MIP-1β/CCL4, found in bronchoalveolar lavage fluid (BALF) of smokers affected by chronic bronchitis compared to smoking or non-smoking healthy control groups, showed a moderate negative correlation between MIP-1β/CCL4 levels and forced expiratory volume in one-second values (p = −0.64, p = 0.035) of chronic bronchitis [32].