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Based on this, four locations were selected from each land-use to study the density of littered cigarette filters, so a total of 12 locations were investigated by visual survey method 16
Centers for Disease Control and Prevention and the World Health Organization for comment
Our study indicates that cigarette smoke exposure inhibits cholesterol efflux in airway epithelial cells, leading to increased intracellular cholesterol levels, promoting ROS production, and the secretion of inflammatory factors, thereby exacerbating cigarette smoke-induced airway inflammation
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