Physicians from the University of Pittsburgh Cancer Institute and Cancer Centers are urging the U.S. House Subcommittee on Domestic Policy to support additional research into the potential health risks of cell phone use. While there is currently no definitive evidence that shows cell phone use is harmful, doctors say users should be cautious, especially when it comes to children. According to doctors, children may be at a greater risk of cell phone-related health problems, as they have thinner skulls.