There's been a fair amount of research on how electromagnetic fields effect and affect on humans.
Anything from the introduction of the telegraph to much higher frequency technologies all seem to have good records on the human health outcomes.
In the First World War, most country boys were affected by electric fields in a way that city boys were not.
It would appear to be a fact that electric fields are something that the human body can adjust to over time but rapid exposure seems to have deleterious affects on health.
