What kind of cancer does Styrofoam cause?

Online Answer
After years of debate and evidence collection, the World Health Organization (WHO) has just reclassified styrene from being a "possible carcinogen" to a "probable carcinogen." Styrene is a chemical building block of polystyrene, the plastic material used to make styrofoam and many other plastic products.
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Products derived from plastics, and those especially from oil, tend to be seen as environmentally unfriendly. Polystyrene is also slow to biodegrade which adds to its poor reputation among environmentalists..
Polystyrene is highly flammable and ignites at relatively low temperatures. It has been linked with huge fires, often in commercial buildings and warehouses, where its use is more common.