In 1990, only 4 million Americans used a cell phone. Today, that number has climbed to 224 million Americans, intensifying the debate over whether they might cause cancer.
The concern whether electromagnetic fields can penetrate into the human brain. Dr. John Boice of Vanderbilt University is part of a scientific team looking into the theory. So far, here is what they have found.
"There have been studies of brain tumors, leukemia, salivary glands, cranial nerves and the vast number of studies now being published around the world are really not finding any evidence for increased cancer risk," says John Boice, Sc.D. Cancer scientist of Vanderbilt.
Dr. Boice says their studies continue. In fact, it is expanding to follow digital phones and other new technologies, but for now he says talking while driving remains the only clear cell phone health hazard.