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"Because the combustible cigarette smoke and e-cigarette aerosol that people inhale doesn't have direct contact with the blood vessels, and the blood does, we took blood serum (the clear liquid in blood that remains after it clots) from every participant and put it in contact with endothelial cells in a culture dish to evaluate how the different serum samples affected the functional behavior of those cells." Springer said

1 cause of teeth yellowing is lifestyle," Philipp told Live Science

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Quitting smoking gives your gums a fighting chance to heal and respond to treatment