how much is an e cigarette What's the Difference Between E-Cigarettes and Vapes? E-cigarette | Characteristics, Safety Issues,

It was the highest among dual users (GM: 1030.5, median: 1258.9 ng/mL), followed by c-smokers (GM: 842.5, median: 1163.0 ng/mL), e-smokers (GM: 119.5, Median: 309.7 ng/mL), and non-smokers (GM: 0.8, Median: 0.8 ng/mL)

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These categories are gaining momentum as consumers seek perceived lower-risk alternatives, although long-term health impacts remain under scrutiny

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In summary, these limitations, predominantly cross-sectional and self-reported study designs, absence of long-term longitudinal research, minimal mechanistic investigation in youths, and sparse data on exercise outcomes, constrain our current understanding of how e-cigarette use may affect adolescent pulmonary function and physical activity