> I mean it can't be good all this radiation exposure.
The light bulbs in your home spew out radiation. The heating of your home is all spewing out radiation. "Radiation exposure" is meaningless without considering whether or not radiation at a given wavelength will interact with your body in detrimental ways at the given power levels (of course, if you heat your home too much, or set fire to it, the infrared radiation/heat will kill you; but we don't for that reason conclude heat is inherently bad) or not.
Talking about "radiation exposure" without being specific about those things is as meaningless as suggesting eating is bad for you because some things are toxic.
Some radiation is very bad for you. Some is essential for you to some extent and dangerous for you if you get too much. Some just won't interact with your body in any way that matters.
> As far as I know, people living near large electrical wire high tension poles are at a higher risk of cancer already.
There is some very limited evidence that shows that strong electromagnetic fields may have some limited effect specifically for incidence rates of childhood Leukemia, but notably only at levels found at too few houses for the researchers to get a large enough sample size to be able to draw conclusions either way. In other words: We don't have any clear evidence of that. We have some research that may hint at some link under conditions to rare for us to have anything conclusive.
It's worth researching, because even a very minor increase in risk would have substantial long term effects, but it's not something that really has any relevance to the safety of 5G at all, any more than the fact that too much infrared radiation (heat) will burn you. They're different things.
[1] provides a detailed walk-through of different claims, sources of electromagnetic fields and radiation and what different studies say about this.
[1] https://www.cancer.gov/about-cancer/causes-prevention/risk/r...