If your gut instinct says it is not a good idea, don’t do it. Get a corded headset.
I would hate to have to tell you that I told you so.
If you don’t believe there’s enough research to prove a link, use common sense. Don’t follow the herd.

Cell Phones & Cancer

“Moskowitz recommends getting a corded headset and keeping the phone away from your body. Even holding the phone a few inches from your ear makes a big difference in terms of exposure, he said.

Bluetooth devices, which produce much less energy than cell phones, may still be problematic if people keep them on next to their heads all day, as the length of exposure is also relevant, he said.”