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Carbon monoxide from smoke further blocks oxygen transport , intensifying the effect

(For a thorough comparison of emissions from heated tobacco products, e-cigarettes, and conventional cigarettes, see this recent review.) But even if heated tobacco compares favorably in a one-to-one comparison to conventional cigarettes, how people use it matters too

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Burden of chronic obstructive pulmonary disease and its attributable risk factors in 204 countries and territories, 19902019: results from the global burden of Disease Study 2019

These donors included six never-smokers (hereafter, non-smokers) and six heavy smokers (hereafter, smokers