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Ethics declarations Competing interests The authors declare no competing financial interests

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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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We decided to focus on chargers that have one of each, as this gives you the flexibility to charge newer USB-C devices, plus a legacy USB-A port that can connect to any USB devices as long as you have the right cable

The filters do all the work, and they dont last forever, especially with smoke