Kim said there is a body of statistically significant work linking cell-phone use to cancer, although it falls short of definitive proof. Some industry people may not like it, but we still need to let the public know. For his part, Lai tells people to use cell phones if they need to. He agrees with the industry that a link to cancer has not been proven. It's like the beginning of the tobacco lawsuits.
Research is a slow process.
Scientists are always conservative, too. I don't know.