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NCBI (2010)

"But we found the e-liquids caused changes in the endothelial cells that are closely related to those seen during the development of cardiovascular disease." The researchers investigated the effect of six different popular e-liquid flavors - fruit, tobacco, sweet tobacco with caramel and vanilla, sweet butterscotch, cinnamon, and menthol - with nicotine levels of 0, 6, and 18 milligrams per milliliter on endothelial cells derived from human iPS cells

This can be especially important for parents and guardians, whose children might sometimes use these terms to try and secretly discuss using drugs

Well go over these precautions later