none were traceable to a microbial source, but all reported recently using e-cigarettes [39, 40]
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doi: 10.1017/s0033291713000627
Achieving this can be challenging and great care has to be given when choosing exposure dose ranges, which can be based on (i) animal to human exposure conversion factors for in vivo studies [82] and (ii) human data for in vitro studies [83, 84]
However, only 6.4% of students who currently used e-cigarettes reported using tobaccoflavored products." To further discourage vaping among teens and adolescents, the FDA added that it has placed tough marketing restrictions on the Vuse products, to guard against youth access and exposure