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In addition, when mixed with the flavorings that draw teens to enjoy vaping, the combination causes four times as many microbes to stick to teeth and double the growth of biofilm
Professor David Gang is quoted by Phys.org as stating that Not only does it tell you, yes, you found the plant you're interested in, but it also can tell you what else was being smoked. The First Evidence of Native American Non-Tobacco Plant Smoking This methodology allowed them not only to determine if tobacco was smoked by the Native Americans in the pipe, it also allowed them to determine the species of the plant being smoked
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Brown SD, Unger Hu KA, Mevi AA, Hedderson MM, Shan J, Quesenberry CP, et al