It used surveys, which dont tend to offer the most detailed information, such as the type of e-cig used
This means that if the gums get infected, the immune system would have a difficult time fighting off the infection, making it a lot harder for the healing process to occur
Chung-Hall J, Fong GT, Meng G, Cummings KM, Hyland A, OConnor RJ, et al
Geol Soc Amer Spec Pap, Boulder, Colorado Erslev EA, Rogers JL (1993) Basement-cover geometry of Laramide fault-propagation folds, in Schmidt CJ, Chase RB, Erslev EA, eds, Laramide Basement Deformation in the Rocky Mountain Foreland of the Western United States: Boulder, CO, Geol Soc Amer Spec Pap 280: 125146 Feeley TC (2003) Origin and tectonic implications of across-strike geochemical variations in the Eocene Absaroka volcanic province, United States