100mG = huge?!?
You could say "relatively", but that's about all.
To me, relative field strength means nothing without a frequency analysis. Higher (much higher; ~microwave) frequencies do have somewhat measurable effects on biology. We can't really observe any low frequency effects, at least not anywhere near that level (not even at many orders of magnitude).
Even the kinds of field strengths observed around MRI equipment have no measurable effect until you go dynamic at much higher frequencies.