There isn't much saying that 3g and 4g are not already affecting us in some way. But since the higher the "g" the higher the radiation, 5g would potentially be the most harmful one yet :(

It's hard to get away completely, but you can minimize personal use with devices. Use airplane mode often, and switch of 4g when you don't need the extra boost. It will also help with battery life!

I hear that the radiation is also a logarithmic scale, so distance from the tower/device makes quite a big difference.