Cell phones and tumors

Living on Earth has a piece on the complicated results of recently-released Interphone study on possible increased risk of brain tumors from cell phone use.

The segment points out that one of the reasons we don't have very much of an answer yet on the question is that the studies are from a time when people used cell phones much less. Brain tumors take time to happen, so you have to study cell phone users from years ago. So the "high use" category they talk about in this study is people who talk more than 30 minutes per day.

As for everyone who talks much more than that, we're going to need more time to get a decent sense of the effects.