Yeah, well I do wonder, your statement is on current medical knowledge. Like cigarettes used to be.
It is a known fact that part of your brain is warmed up by "non-ionizing radiation" just like a microwave oven (which also uses non-ionizing radiation) warms food when using a cell phone, something visible light doesnt do.
So I dont know about the only way to be hurt by using a device over a period of decades or less. I dont think about it much but there is something to be said that I wouldn't want a cell phone or wifi device glued to my head 24 hours a day.
Its the same reason WiFi power is limited in routers. It has to be kept at a level that the federal government considers safe to be next too 24 hours a day, its why when you buy a router, you can end up with the same range as a well made $100 router when paying $350
(btw- just my thoughts, I do not give much thought to being exposed to Wifi though will admit I would not place a router on near the headboard of my master bedroom bed where I lay in front of it 8 hours a night.
I recommend reading some high school physics before making judgement like that. Let's start with power and distance, assuming you have antenna that are 2D (a pole, not a point, radiate the same power to the circumference of a circle), and your power reached from the antenna to you would be 2 x Pi x R. Wifi you use on your phone and laptop are mostly download from the internet instead of upload, you are not running a server or live streaming your tik tok 247, so that most of the traffic these days (assuming you do not have unlimited data from your phone plan) is from wifi router off cable / fiber / DSL. Those only have emission mostly when you are downloading stuff. The amount of power to broadcast the "hey there is a router here" signal is very low and very short, like, 1/1000 of the amount or even less than full on downloading.
So, looking at the amount of traffic you go down vs up stream you will realize unless you are talking on 2G/3G network all day you are likely not emitting much anything from your phone. How many minutes do you talk a month? 100 mins? even with video conferencing I'm not doing that much, I'd say I've only used about 20 mins a month last month, with way more texting and zoom / webex / team conference than that (like 3 hours a day on average). Your radiation from your phone glue to your head (very short distance, like 2 inches) are very low. Your radiation from wifi router to you (assuming 10 feet) is let's say 20x the amount of traffic to your phone downstream than from your phone to your router, but the distance is likely 5x further (assuming you use your phone 2 feet from your eyes). 2 x Pi x R, with 5x the R means 1/5 the power. The 100mW of power from your router would be equivalent to 20mW power from your phone to your router. Some napkin math here: 20mW power from router for 20mins of actual transmission time per day (because most of the time you are just watching the screen and nothing is transmitting) vs 100mW of power from your phone to your router for 1 mins of actual transmission per day (the transmission is to acknowledge the packet to the server that you have received the data, so they do not retry and will send you new data instead, this is how TCP/IP works), you are getting 20mW x 20mins + 100mW x 1 mins = 400mWmins + 100mWmins = 500 mWmin of power send to your head. This is like having a wifi router stick to your head and download for full 1 mins. So, using smart phone isn't dangerous compare to other stuff like sunbathing. Living next to a cell tower would likely be a much higher risk but not from your phone, those are 20W each antenna from what I remember.
I am not sure if wifi on phone does this but on cellular, at least in LTE, if you are having good reception from the cell tower your phone will reduce the transmission power because it does not need to use that much battery life to transmit and the tower will still get it. The positive side effect is your will get less radiation from your phone despite more radiation from your tower.
In highly congested area, when carrier put up new tower they will reduce the power from nearby tower to make a smaller cell, and reuse the same band again, and everyone will have reduced radiation because the distance from antenna is shorter and they can reduce the transmit power.
Power kills, your microwave oven is 1000W typically, not 100mW. You shouldn't keep a wifi router near your headboard because it is bad for reception to begin with.