It's thought to be well-known by people who don't actually know.
Ionizing radiation is harmful. But sunlight is a lot more harmful than cellphone tower radiation. About the worst you can get from a cellphone tower, if you're working up at the antennas, and disconnect a cable, and the center conductor is touching your skin when the tower tries to transmit, is a small burn. Other than that, if you're right in front of one of the faces (there are normally 3 faces, each covering 120°), you might feel a little warmth. (It's the same "radiation" as used in radiodiathermy.) But by the time the signal has reached ground level (towers usually put the antennas up a few hundred feet) - you're getting more (and in most cases higher-frequency, therefore more "dangerous) radiation from your WiFi router. By the time you get outside the fence surrounding the tower - the radiation is minimal. (Cellphone SAR is advertising hype, it's not a real concern, and never was. The same frequency and type of radiation, but at 25 times the power, came out of police walkie talkies at the time SAR was first introduced. And you don't see stories about the tremendous increase in brain cancer among LEOs, do you?)
(It's not "radiation" that's dangerous - we've evolved in a world filled with radiation of various types for a few billion years, it's ionizing radiation that's dangerous.)
True. I've only gotten my education in communications electronics, and been in the field for over 61 years, so some people probably know more than I do.
Aside from a burn scar I still carry after about 47 years (and would if I lived to be 200) from having a cable touching my skin, when the other end was disconnected and clearly tagged "DO NOT CONNECT!" - and someone connected it and sent 600 Watts of UHF signal through it ... I've worked around 600 Watt UHF transmitters for decades. used two way radios of various kinds up against my head for longer than that ... and Monday, at my VA appointment, my doctor commented that she wished that all her 76 year old patients were as healthy as I am. Evidently all that, probably, thousands of times of exposure to "radiation" than most people will ever get hasn't harmed me in the least.
Will it bother me if they start putting up 5G microcells on every block? In a way - I don't intend to upgrade to a phone that can handle 5G for at least a few years, so I'll have to hope that T-Mobile keeps their 4G network going until I'm ready to upgrade. But healthwise? I'm more concerned with the flu every fall. My WiFi router is sitting about 2 feet from me, my cellphone is sitting in a holster on my belt, and that's a lot more radiation than a 5G microcell on the pole across the street would subject me to when I walk to the front of the property line to get my mail. So no, I'm not worried. Since 5G will be operating on the same frequencies as 4G (and that's what determines the danger), and since 4G microcells (and repeaters that people have in their homes if they live in weak signal areas) have been all over the place for a few decades now, the danger isn't going to increase.