> If cell phones or microwaves or a hundred other things were harmful we would not find out

While I agree that there may be things which have subtle but cumulatively harmful effects over time, the two specifics that you cited (cell phones and microwaves) are very poor examples because they've been deployed so broadly for so long, the chances there is some significant medical harm still undetected is vanishingly small.

> the chances there is some significant medical harm still undetected is vanishingly small

I don't think this statement is true.

Long-term effects can only be observed over the, well, long term which makes it hard to compare with the baseline. It was measured differently and with very different external factors. Then even if we do by chance manage to observe the harm today it could be very hard to identify the reason — we would see the factual result but neither the process nor the cause.

Take any unexplained health issue we have today, e.g. decline in male fertility estimated at 50% in western counties since 1970s, a dramatic change. Could it be microwaves? Well possibly, can't be ruled out at this point, among many other candidates. Furthermore, with the new research saying that 1) microwaving food in "microwave-safe" plastic containers releases huge number of microplastic particles into the food and 2) microplastic accumulates in testicles — it's not even a fringe science anymore but a normal theory to be studied and be proven or disproven.

Do we have any other health issues that increased over the past 50 years? Yes. What caused them, is it something recent that became popular in the past 50 years? Very likely, yes. Do we know it? Not yet.

It took us a very long time to figure out cigarettes. Or leaded fuel, even though we knew in advance that lead is poisonous.

>cell phones

Well, as far as direct physical harms, yes, but as far as mental harms that translate to physical harms, the jury's still out:

'“Given that the increase in mental health issues was sharpest after 2011, Twenge believes it’s unlikely to be due to genetics or economic woes and more likely to be due to sudden cultural changes, such as shifts in how teens and young adults spend their time outside of work and school.'

https://www.apa.org/news/press/releases/2019/03/mental-healt...

> because they've been deployed so broadly for so long, the chances there is some significant medical harm still undetected is vanishingly small.

Cancer rates continue to rise, and will be well over 50% of all people in my lifetime.

There is no doubt our current world is making us very sick.

Also, trial lawyers would rapidly become the wealthiest people on Earth if genuine, reproducible evidence of harm from non-ionizing radiation could be found.

If you thought the tobacco and silicone breast implant settlements were impressive...