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How smoking makes lips darker over time Darkening of the lips from smoking is a gradual process that involves multiple biological mechanisms

and Puerto Rico have passed comprehensive smoke-free indoor air laws that include e-cigarettes, as of March 31, 2023

Other limitations are the high number of exclusions due to technical reasons and practical deviations during testing (like delays in measurements, positioning of the blood pressure cuff, or distraction of participants from consumption during blood sampling) also influencing participant comfort

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