I answer to this question.
They began to study the harm from all kinds of radio devices somewhere in the forties of the last century. Then they built powerful radars that could act on people like a microwave oven. Well, there were literally hard-boiled eyes, and various liquids inside the body boiled.
Then there was a boom of amateur radio stations, which also played very powerfully.
Then came the time of mobile phones, which were applied to their head by every second person.
Somewhere around 2010, radiation from mobile phones was solemnly declared a possible carcinogen. That is, it could theoretically cause the development of a malignant tumor.
There were studies that found a slightly greater risk of developing brain tumors from regular use of mobile phones, but it took about 10 years to identify such a risk. As a result, it was decided that the harm had not yet been unequivocally proven.
There was a suspicion that if you put your cell phone to the same ear every time, then, probably, there will be more harm.
Around the same time, it became clear that children with their small heads and thin bones of the skull absorb about 10 times more radiation.
In 2019, scientists analyzed the results of existing studies and decided that there was no clear evidence of the harmful effects of mobile phones. Neither brain tumors nor tumors of the salivary glands (they are just near the ear) could be connected to the phones.
At the same time, the authors made a reservation in the sense that if you use a mobile phone for more than 15 years, if a mobile phone is used by a child, and if we are talking about some rare types of brain tumors, then nothing to guarantee it is impossible.
What's wrong with bluetooth
This technology emits about 100 times less energy than a cell phone. Even if there was some harm from this case, it would have been studied for another 10 years.
There are studies that have tested the functioning of the auditory nerve after wireless headphones and found nothing.
It is clear that, just like with the phone, children will be more sensitive to radiation from wireless headphones.
Considering the fact that experts were very reluctant to study the topic of mobile phones and did not give any intelligible explanations, then we will not get answers about wireless headphones for a long time.
You can focus on the standard 60/60 rule. That is, do not listen to something through headphones for more than 60 minutes a day and louder than 60% of the power.
Have you noticed in phones that they warn about harm to hearing before raising the volume above 60%? I'm being warned.
Perspectives
In theory, all sorts of regulatory organizations should plan and conduct research, such as those where hamsters will insert headphones in their ears and then test them for brain tumors. But I haven’t heard anything about this yet.
In the near future, there will be so many new sources of radio waves around us that our hands may not even reach our headphones.
All sorts of 5G will be built at every corner, and they will scald us with directional radiation. I am not kidding. This technology emits high frequency radio waves that easily get stuck in obstacles, so antennas are more likely to be aimed like cannons in some direction.
These 5Gs will not go deep, but rather will get stuck in our skin, so we will have to study this action in a new way.
Well, besides 5G, our homes will gradually be filled with modern technology. Internet of Things and all that.
It turns out that the oven in my kitchen would like to communicate with my phone via bluetooth. I just do not allow her and even forgot about this case. Can you imagine how many such garbage will be in 5 years?
In short, the harm from cell phones has not been proven.
Not everything is clear with children. If there is harm, they will be the first to suffer.
Those who have been using mobile phones for more than 15 years (like me) may expect some surprises in the near future.
Bluetooth headphones are about 100 times weaker than a mobile phone, so there should be less harm from them.
Follow the 60/60 rule to keep harm to a minimum.
