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A, B, Representative boxplots showing of plasma levels of HOI, arylesterase activity, and paraoxonase-1 antioxidant biomarker activity before and after exposure sessions: e-hookah vaping (A) and combustible hookah smoking (B). The solid horizontal line represents the median, the box represents the 25th to 75th percentiles, and the whiskers represent the 10th and 90th percentiles. HOI = high-density lipoprotein oxidative index.
