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"For example, e-liquids have varying levels of nicotine concentrations, and some e-cigarette design features may allow a user to obtain high levels of nicotine quickly." E-cigarette use behaviors also vary, the FDA said, and users may deliberately or inadvertently inhale more nicotine than would typically be expected

Pathogenesis of chronic obstructive pulmonary disease

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Briefly, the RCT implemented a 22 between-subject factorial design, with participants assigned to one of four cigarette packet labeling groups: small text-only health warning labels on pack sides (control)