Are you within 20cm of the radios?
Those warnings are generally in place as a defense against lawsuits, meaning if you did get sick they would say you ignored the warnings and so it isn't their fault.
That doesn't mean that being within 20cm is dangerous, it just means they think if it was dangerous that being outside 20cm might be safe(er).
How do they come up with the number? Who knows, they may have actual research on rodents or something or they might just do some math and think that sounds like a good number. Obviously they can't pick an unreasonable distance or no one could use the device within the safety guidelines.
FFC type regulations often don't mean much, unless you want to sue someone or not be sued yourself. In the past they have been horribly wrong and you have lots of cases of things with no evidence of being dangerous getting banned due to pressure from lobby groups.
There are some difficulties with this area. Firstly it's practically impossible to do a controlled study on humans, since all of us are subject to a bunch of RF radiation. Where are you going to get your control group that doesn't have a cell phone or WiFi?
Unless there is new research I'm unaware of, there has previously been no known biological interaction with RF and human tissue that could cause the sort of cell damage required to cause cancer. This is true of all non-ionizing radiation, there simply is no known method for it to cause us harm in that way.
It can certainly heat you up to the point you would burn if there was enough power, so I wouldn't recommending standing in the path of a really high power transmitter up close.
Of course not knowing of a way it can be harmful doesn't mean it's perfectly safe either. I can really only suggest you read some proper peer reviewed studies on the effects of RF and make your decisions based on that. Keep up with the latest research so you know if anyone does find some risk factors you need to think about.
There is a lot of scare mongering out there, but you can usually identify it because they want to sell you something.
Also make sure your work place is following any relevant safety guidelines.
I should also say there are studies that show a statistical link between RF exposure and cancers. They aren't great studies because they don't really eliminate other environmental factors well. One I recall was of military radar operators from several different countries where they all had statistically significant increases in rates for certain cancers compared with other personnel and the general public. The other I remember was done on people diagnosed with certain head tumors and studied their mobile phone usage, which found most of the patients had high levels of mobile usage.
So there has been some statistical evidence, even if the mechanism is unknown. But like I said, these studies don't really control for other factors. For example high powered radar equipment is constructed with a bunch of fairly toxic materials, how much exposure did the operators have to these? The study did not investigate that.
Mobile Phone Study
Radar Operator Study
Accuse me of scare mongering if you want, but it's not fair to say there hasn't been evidence of correlation. Which is not causation, obviously.