The possible connection between cell phones and cancer is controversial. For many years, studies on cell phones and cancer have had mixed results, but there is currently no consensus on the degree of cancer risk.     The main concern with cell phones and cancer appears to be brain tumors associated with cell phone use. This, and some studies indicate that there has been a slight increase in the incidence of brain tumors since the seventies of the twentieth century, but cell phones were not used at that time.     Instead, this small increase is likely related to other…