The Dangers of Cell Phones?

I have a few friends who use Bluetooth headsets, and one told me an upsetting story about her sister’s friend, who was a day trader and constantly on her cell phone, and who developed a brain tumor, allegedly due to the radiation.  (According to her, the headset prevents this exposure).  While I still use my cell phone regularly (how can you not?), I do sometimes feel a little nervous about it.  Cell phones are so omnipresent-it’s hard to imagine modern life without them.  I was quite worried when I read this article on the dangers of mobile phones-particularly for pregnant women and children.  It left me wondering, are mobile phones the cigarettes of the future?