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(8) Questionnaire of Smoking Urges-Brief (QSU-Brief) designed to measure research participants level of craving and urges to smoke cigarettes assessment [19]

Cannabis smoke presents an additional challenge

* Blood serum from participants who regularly vaped, but not those who regularly smoked, increased endothelial cell permeability, allowing more substances to pass through the cells and causing them to behave more like those in leaky blood vessels, which can cause tissue edoema

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The liquids contained diacetyl in concentrations far higher that those recommended by the National Institute for Occupational Safety and Health (NIOSH)