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METHODOLOGY To find out how many cigarettes are smoked indirectly due to air pollution around the world, we found the average 2024 PM2.5 concentration data for the most populated cities in every country on We then used Berkeley Earths rule of thumb that one cigarette approximates to 22 g/m3 PM2.5 concentration

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Researchers measured endothelial function and performed cell culture studies to investigate the association of chronic e-cigarette use on levels of vascular impairment in all subjects at a specific point in time