Can the one thing you might not be able to live without cause brain cancer? Despite numerous scientific studies that have not shown a connection between cell phones and brain cancer, Ronald Herberman, MD, director of the University of Pittsburgh’s Cancer Institute, sent a memo to 3,000 colleagues warning that mobile phones are dangerous and should be kept away from children.

Based on his unpublished study, Dr. Herberman wrote: “Although the evidence is still controversial, I am convinced that there are sufficient data to warrant issuing an advisory to share some precautionary advice on cell phone use.” He added,  ”The heart of my concern is that we should not wait for a definitive study to come out, but err on the side of being safe rather than sorry later.”

He recommends adults use headsets or speakerphones when speaking on cell phones and children use cell phones only in emergencies.

The Food and Drug Administration (FDA) and the Cancer Society of America do not agree with Herberman’s conclusions.