CNN

Radiation from cell phones can possibly cause cancer, according to the World Health Organization. The agency now lists mobile phone use in the same "carcinogenic hazard" category as lead, engine exhaust and chloroform.

Before its announcement Tuesday, WHO had assured consumers that no adverse health effects had been established.

A team of 31 scientists from 14 countries, including the United States, made the decision after reviewing peer-reviewed studies on cell phone safety. The team found enough evidence to categorize personal exposure as "possibly carcinogenic to humans."

What that means is they found some evidence of increase in glioma and acoustic neuroma brain cancer for mobile phone users, but have not been able to draw conclusions for other types of cancers

"The biggest problem we have is that we know most environmental factors take several decades of exposure before we really see the consequences," said Dr. Keith Black, chairman of neurology at Cedars-Sinai Medical Center in Los Angeles.

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Consumer Affairs

Since the days when cell phones were the size of bricks, there has been debate over the safety of these devices, which use radio waves to transmit voice and data.

A number of studies, stretching back more than a decade, have suggested extended cell phone exposure increases the risk of tumors...

Cellular-News.com

The ordinance, passed last year, would require the Sar figure to be displayed next to each phone being offered for sale, but has faced fierce opposition from within the industry, with a lawsuit from the industry trade...