It is difficult to determine the exact power output from cellular towers. The only difinitive limitation is an FCC regulation that limits urban cell towers to 100 watts of radiated power and rural towers to 500 watts. This is not an overwhelming amount of power. The decrease in EM field strength is inversely proportional to the distance squared. This means that the signal is reduced in field strength in a reducing logarithmic curve. Distance decreases field strength very dramatically. Your receiver sensitivity in your cell phone can exceed a 10dB SINAD at levels below -120dBm. This is an extraordinarily small amount of power. It is so small, we don't even use watts anymore at this power level, we use microvolts and fractions of microvolts. A 100 watt tower is +50dBm, by standing 100 feet away, the power level has decreased by approx 68dB. This equates to -18dBm, which is approx. 16 microwatts. -18dbm is a massive amount of power to a cell receiver, so for your device, the cell tower dynamically lowers the power that it is aiming toward your device via beamforming technology. This reduces the power required by the tower and thus reduces the cost of running the tower. The most significant power you are actually being exposed to is the Transmit power from your cell phone to the tower. The signal coming from the tower is virtually insignificant. I believe (but am not positive) that commercial cell phones are limited to 1 watt of transit power (+30dBm), however this power output only occurs if you are having difficulty communicating with a tower. If it vmcan do it with less power, it dynamically adjusts down to minimize the power your transmitter is using and increases your battery life. At this power level, you aren't capable of causing harm to a human being. The frequencies are far too low to be ionizing radiation, which is required to cause damage to cellular DNA bonds. This threshold is demarked at the frequency of UV light, which starts its frequency range at 1 Petahertz, that is 10 to the 15th power. Since 5G cannot even get close to 100Gigahertz or 10 billion hertz (10 to the 9th power).

With a high enough power level and a close enough distance, we can cook a human being (if you are into that sort of thing), but you aren't going to give them cancer.