Polystyrene is a popular material for single-use food packaging such as takeout boxes and to-go cups. Most people colloquially refer to this material as Styrofoam. While polystyrene foam is likely safe for one use, reusing the packaging or keeping it for too long increases the chance of styrene exposure.
Styrene is a carcinogen that may damage white blood cells and boost the risk of cancers like leukemia and lymphoma.

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