A new Canadian study reports that 558 lifetime hours of cell phone use doubles the chance of gliomas, a deadly brain cancer.

Canadian Study Finds Cell Phone Use Increases Risk For Brain Cancer
 
Governments have allowed this technology to pervade our lives saying it did not have proof it could harm us. We now have evidence from the latest Canadian Interphone study data that found a statistically significant doubling of risk for glioma among cell phone users with only 558 lifetime hours of use.

How long will it take a teenager to amass 558 hours of cell phone use?

https://ehtrust.org/canadian-study-finds-cell-phone-use-increases-risk-for-brain-cancer/

https://www.ncbi.nlm.nih.gov/pubmed/28535174