evidence: "If we're talking about these major health concerns, I think we have the answer pretty much," Dr. Timothy Rebbeck, professor of cancer prevention at the Harvard T.H. Chan School of Public Health and professor of medical oncology at the Dana-Farber Cancer Institute, said about the back-and-forth over cell phones and cancer risk. And according to Rebbeck, though there's less research on newer technologies such as Bluetooth devices than there is on cell phones, the fact that they're all emitting low amounts of the same type of generally harmless radiation should put tech users at ease. [...] But for people concerned about RF-EMFs, relying more heavily on Bluetooth devices rather than a phone may actually be the preferred method. According to the National Cancer Institute, research has found that Bluetooth devices like earbuds and headphones emit short-range signals that give off radio-frequency waves at powers 10 to 400 times lower than cell phones. "We don't have the same kind of data that we do from cell phones, but there's not any evidence that type of [Bluetooth] exposure should be able to cause cancer in normal use," Rebbeck said, adding that the radiation dissipates very fast.