Table 1 Methodological quality assessment of the studies included in the systematic review Table 2 Description of the studies selected about EC use risk and protective factors, and motives for use In Figure 2, most studies are cross-sectional 47,50-53,55-58,64,66,67,70,71,75,78,79,96 , followed by longitudinal studies 54,61,62,68,74,76,77,80
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The lower levels of nicotine among those exposed to second-hand vaping were consistent with previous laboratory studies finding that people retained 99% of the nicotine they produced during vaping
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