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Cigarette smoke exposure HBE cells were exposed to mainstream smoke from 3R4F University of Kentucky reference cigarettes (Lexington, KY) using a VC-10 Smoking Robot (Vitrocell, Waldkirch, Germany) in accordance with ISO 3308 standards (puff duration 2 s, hold time 0 s, exhaust time 8 s, puff volume 35 mL, frequency 60 s, 6 puffs per cigarette)

If the smell returns within two weeks of a deep clean, the coil itself has

Carbon-X works with every Weedgets pipe including the Maze-X, X7 or X5 One-Hitters, and classic Maze Pipe

doi: 10.1016/j.jhep.2010.07.040

For respondents who provided their income, we grouped family income into four categories: under $20,000, $20,000-$44,999, $45,000-$74,999, $75,000 and above