Though fracking industry proponents scoff at any intimation their so-called vital industry poses even scant risks to the public, a new study published in Toxicology and Applied Pharmacology just proved those critics right — fracking wastewater causes cancer.

Using human bronchial epithelial cells, which are commonly used to measure the carcinogenesis of toxicants, researchers confirmed fracking flowback water from the Marcellus Shale caused the formation of malignancies.