Sure they do. Cellphones have been in wide circulation for at least 15 years. And every day I see people in the street just collapse from brain tumors. The government should do something.
Your mild sarcasm is spot on. Given their wide distribution and extensive use, if cell phones had caused brain cancer, the effect would have shown up in epidemiological data as an increased incidence of brain cancer. In fact, since the introduction of cell phones in the 1980’s there has been a slight decrease in the incidence of brain cancer. Case closed.