E cigarette flavors are toxic to white blood cells, warn scientists E cigarette flavors are toxic to white blood cells, warn scientists Bans on Flavored Vapes Have Pros And Cons, Study Finds Chemicals in vapes could be highly toxic when heated, research finds AI analysis of 180 vape flavors finds that products contain 127 'acutely toxic' chemicals, 153 'health hazards' and 225 'irritants' : r science