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3. Cell phone use causes cancer.
The fear here is that radio frequency waves emitted by cellular phones are associated with higher risk of various brain cancers. One anecdotal report even suggested that women who secreted their cell phones in their bras were more likely to get breast cancer.
It is true that in 2011 the hyper-precautionary International Agency for Research on Cancer classified cell phones as a "possible carcinogen." But as a somewhat snarky response in the Journal of Carcinogenesis pointed out, the agency classifies coffee and pickles as possible carcinogens, too. Meanwhile, the National Cancer Institute flatly states that "to date there is no evidence from studies of cells, animals, or humans that radiofrequency energy can cause cancer." A 2012 comprehensive review of studies in the journal Bioelctromagnetics found "no statistically significant increase in risk for adult brain or other head tumors from wireless phone use."