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These cytokines (IL-4, IL-5 and IL-13) are markers for discriminating Th2 cells, and there are many other specific markers on the surface of Th2 cells, including CCR3, CCR4, CCR8, CXCR4, and ST2/IL-1 R4 [98, 99]

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That many regular vapers were able to free themselves also from the behavioral component of smoking that was being reproduced by vaping the product under investigation, indicates that the e-cigarettes are not very "addictive"

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