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What we do know is that people don't just use one or the other. In fact, most people start vaping nicotine with flavors or without flavors, and then they add other layers. They've become more sophisticated, especially in youth. Because then they get into, well, "You can get some from the black market most often," and they can actually fill in the cartridges with whatever they just purchased. The unfortunate part of it is that there was an epidemic of lung injury, associated death, and hospitalization. Several people needed lung transplantation. [...]