（来自百度）

美国著名匹兹堡大学癌症研究所主任赫贝曼博士前天向3000名教职员发出警告，指打手机有致癌风险，应限制用量。据香港《文汇报》报道，这是首次有大型研究机构发出类似警告，赫贝曼表示，警告是根据未公开的初步研究结果而发出，是要防患未然，若等到有切实证据才行动便会太迟。

警告建议成人应将手机远离头部，谈话时亦应使用扬声器或免提装置；而儿童由于脑部仍在发育，除非紧急情况，否则不应用手机。他又建议不要在巴士等公众地方使用手机，指会令其他人曝露在电磁场中。科学家一直忧虑手机发出的电磁辐射会影响人体健康，不过学术界对此仍未有定案。

犹他大学本年亦分析9项癌症研究，当中包括赫贝曼引用的研究，涉及数以千计脑瘤病人，结论是“手机客户长脑瘤的风险整体而言没提升，长期使用手机的潜在提升风险则有待未来研究证实”。去年在法国及挪威的研究，亦有相同结论。美国食品及药物管理局(FDA)在网站表示，至今仍未发现手机存在风险，即使有，亦应该很小。

另外，法国去年一项依“Interphone”而作的研究，发现正常手机用量“不会显著提升”患3种神经系统瘤的风险，但特别提出“最高用量者”患一种特定脑癌的风险“可能提高”，但仍需未来研究证实。

（来自2011年2月22日美国“HealthDay News”）

A one-hour cell phone conversation stimulates the areas of your brain closest to the phone's antenna, but experts say they still have no idea whether these effects pose any long-term health risk.

"We don't know whether this is detrimental or whether it could have some potential beneficial effects. We don't know one way or the other," said Dr. Nora Volkow, who is lead author of the study published in the Feb. 23 issue of the Journal of the American Medical Association. "Studies need to be done to see if there are long-lasting consequences. It's an important question."

For the time being, the best bet is to use an ear piece or the speaker phone, "particularly in children and adolescents whose brains are much more vulnerable to insults of certain kinds," said Volkow, who is director of the U.S. National Institute on Drug Abuse.

For this study, 47 volunteers were brought into a lab at the U.S. National Institutes of Health, where they had cell phones positioned at both their left and right ears.

Researchers measured metabolism of glucose in the brain -- a measure of how hard the organ is working -- using positron emission tomography (PET) scans. Metabolism in the orbitofrontal cortex and temporal pole regions of the brain, those closest to the antenna, was about 7 percent higher when the right phone was in the "on" position than when both phones were off.

Dr. Nora Volkow, Director, NIDA, NIH （Nora D. Volkow, M.D., director, National Institute on Drug Abuse, U.S. National Institutes of Health）