I haven't looked into WiFi, since this was about static magnetic fields rather than fluctuating magnetic fields, although I have read about the increased incidence of gliomas (a type of brain tumor) caused by cell phone usage. Of course, that only happens when you hold a wifi source up to your head constantly. For this reason, I don't think that wireless headphones are a good idea.

One odd thing I've come across lately are accounts of the effect of MRI magnetic fields on depression. https://www.scientificamerican.com/article/do-mris-treat-dep....

Since ECT and other forms of brain damage have been shown to offer temporary relief from depression when endorphins are released in response to the damage, I wonder if MRIs have a similar effect.