On December 8, 2006, I wrote about a Danish study investigating the possible link between cell phone use and cancer. This largest-ever study of it's kind put fears to rest. Cell phones do not cause cancer, said researchers who announced that cell phone users -- even long-term users -- are at no more risk of developing cancer than their non-cell phone using counterparts.

There's just no biological basis for concern about radio waves, reported the lead investigator of this study. But another newer study reports something entirely different.

Long-term mobile phone users are more likely to develop cancer -- brain cancer, on the side of the head where the phone is held -- according to the Radiation and Nuclear Safety Authority in Finland. It will all be detailed later this year in the International Journal of Cancer, but the general gist of the study is already circulating.

The study -- the second one to suggest an increased risk of cancer due to emissions from cell phones -- found that people who regularly used cell phones for more than 10 years were 40 percent more likely to develop nervous system tumors called gliomas. Comparisons were made between 1,521 people with gliomas and 3,301 people without the tumors. While no connections were initially made between the phones and cancer, a link was found when researchers specifically focused on those who had used their phones for more than 10 years.

Short-term use of cell phones has never been linked to cancer. That's good. But I tend to believe cell phones are going to become even more a staple of our technologically-driven lives than they are now. And so 10 years may actually be considered short-term one day -- which means we all may soon be at risk.

For now, until research becomes more conclusive, we get to pick and choose which study to stand behind. So take your pick -- and stay tuned for future scientific revelations.