Of a single device, but how do we account for the accumulation of the dosages when there are literally dozens of those devices constantly around us?
Let's also keep in mind that we haven't been living like this for very long, 10-20 years ain't really that big of a timeframe. For all purpose and effect, this is a rather recent development in human history.
That's stuff bad dystopian sci-fi stories are made of: 30 years from now developed countries will reach "peak ERM" and people's brains suddenly start shriveling to raisins ;)
Non-ionizing, regulated dosage. Maybe we'll discover they were dangerous, but evidence doesn't support it so far.