TIME.com : You can stop worrying about getting brain cancer from your cell phone. A massive study of just about every private cell phone user in Denmark shows no link between gabbing on your mobile and the development of brain tumors.

The 420,000 participants averaged about 8.5 years of cell phone use, although some of them had been using cell phones for as long as 21 years. But there was not even a hint of an increase in brain cancer incidence the longer they used the phone.

A closer examination of different types of brain cancer from gliomas to acoutsic neuromas showed no increase in brain cancer subtypes either, according to investigators, led by Joachim Schuz of the Institute of Cancer Epidemiology of the Danish Cancer Society in Copenhagen.