Styrene, the main ingredient in polystyrene foam, is a likely human carcinogen, according to both the International Agency for Research on Cancer and the National Toxicology Program. In mice, it causes lung tumors. In people, it increases the risk for leukemia and lymphoma. Styrene-exposed workers in plastics and rubber industries suffer higher rates of cancer, and female workers may have increased risk of miscarriages. As far back as 1982, the EPA discovered styrene in the breastmilk of all of the women tested in four different U.S. cities. Heating up polystyrene foam containers can cause the styrene to leach into the food or drinks. This toxin has no place in our bodies, schools, restaurants or homes.