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Smoking and SHS exposure accounts for the largest exposure to PAHs of non-Hispanic Whites vs other age-matched ethnic groups as well as older age groups (Gearhart-Serna et al., 2021)

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If you use it properly, usually you can feel safe

But then went on to add that: On the other hand, habitual use of marijuana alone does not appear to lead to significant abnormalities in lung function when assessed either cross-sectionally or longitudinally, except for possible increases in lung volumes and modest increases in airway resistance of unclear clinical significance