Research finds that long-term cell phone users have risks for cancer.

In 2011, the World Health Organization’s International Agency for Research on Cancer first classified cell phone and other types of wireless radiation as a “Group 2B Possible Human Carcinogen” based on research studies that found long-term users of cell phones had higher rates of specific types of tumors (glioblastoma and acoustic neuroma) on the side of the head where they held the phone. A Yale study funded by the American Cancer Society found an association between thyroid cancer and cell phone use in people with certain genetic susceptibilities.