Based on data from the literature and our preliminary study after a 4-day subacute exposure (data not shown), two exposure protocols were applied in this study for both e-cig and 3R4F emissions: a 3-month subchronic and a 6-month chronic exposure, 60 min/day and 5 days/week
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Vaping is especially harmful to teens
However, tobacco companies were concerned that this approach was insufficient to allay the worries of health-conscious consumers who might quit completely rather than use low-tar cigarettes [14]
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multiple units Running a single air purifier on its maximum settings will ensure maximum particle removal rate for that particular air purifier but in order to remove particles even faster you need to strongly consider purchasing multiple units