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Don’t be silly. There is a high risk:

YOU are the one being silly, Candor7. VERY SILLY.

Dr. Devra Davis is an ENVIRONMENTAL ACTIVIST. . . She makes money off of spreading fear about technology. She ignores the latest science in favor of her pet studies that she cherry picks that support her money making books. She's the Al Gore of anti-Cell Phone hysteria. . . but lacks the evidentiary backing to support her thesis.

The INTERPHONE study (2001 - 2010 — N = 5000 )
The 13-country INTERPHONE study, the largest case-control study done to date, looked at cell phone use among more than 5,000 people who developed brain tumors (gliomas or meningiomas) and a similar group of people without tumors. Overall, the study found no link between brain tumor risk and the frequency of calls, longer call time, or cell phone use for 10 or more years. There was a suggestion of a possible increased risk of glioma, and a smaller suggestion of an increased risk of meningioma, in the 10% of people who used their cell phones the most. But this finding was hard to interpret because some people in the study reported implausibly high cell phone use, as well as other issues. The researchers noted that the shortcomings of the study prevented them from drawing any firm conclusions, and that more research was needed.
Another part of the INTERPHONE study compared more than 1,000 people with acoustic neuromas to more than 2,000 people without tumors, who served as matched controls. As with gliomas and meningiomas, there was no overall link between cell phone use and acoustic neuromas. There was again a suggestion of a possible increased risk in the 10% of people who used their cell phones the most, but this was hard to interpret because some people reported implausibly high cell phone use, as well as other issues.
The Danish cohort study (1980s - 2011 — N = 400,000)
A large, long-term study has been comparing all of the people in Denmark who had a cell phone subscription between 1982 and 1995 (about 400,000 people) to those without a subscription to look for a possible increase in brain tumors. The most recent update of the study followed people through 2007. Cell phone use, even for more than 13 years, was not linked with an increased risk of brain tumors, salivary gland tumors, or cancer overall, nor was there a link with any brain tumor subtypes or with tumors in any location within the brain.
This type of study (following a large group of people going forward in time and not relying on people’s memories about cell phone use) is generally thought to be stronger than a case-control study.
But this study also has some drawbacks. First, it is based only on whether or not people had a cell phone subscription at the time. It didn’t measure how often these people used their phones (if at all), or if people who didn’t have a subscription used someone else’s phone. There are also limits as to how well this study might apply to people using cell phones today. For example, while the cell phones used at the time of the study tended to require more power than modern cell phones, people also probably used the phones quite a bit less than people use their phones today.
The Million Women Study (1993 - 2003 N = 800,000)
A large prospective (forward-looking) study of nearly 800,000 women in the UK examined the risk of developing brain tumors over a 7-year period in relation to self-reported cell phone use at the start of the study. This study found no link between cell phone use and brain tumors overall or several common brain tumor subtypes, but it did find a possible link between long-term cell phone use and acoustic neuromas.

And, as I pointed out, the greatest control group is all the 2.5 BILLION cellular phone users around the world. . . and the fact that there have been no perceptible increase in brain tumors or cancers during the period of cellular phone usage over the period BEFORE cellular phones were introduced. NONE. ZIP. NADA. ZERO INCREASE. That is the best evidence of all.

As several other Freepers have pointed out, the level of energy emitted by cellular phones was and is not sufficient to break electron bonds of ANY molecules that could result in any breakdown into other chemicals that could be mutagenic or carcinogenic. The emissions are not ionizing.