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What is Propylene Glycol (PG)? , New research from the University of California, Riverside reveals concerning risks of e cigarette use for lung health. The Propylene Glycol (PG) USP Grade for Ejuice Mix PG Central Vapors Researchers at the University of California, Riverside, found that heating propylene glycol, the main ingredient in most e cigarette liquids, can produce two toxic chemicals, methylglyoxal and acetaldehyde, which damage lung cells. Using PG VG Propylene Glycol USP Grade PG for Ejuice Central Vapors
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