A hand held radio like the FRS and GMRS are prohibited from having a detachable antenna by the federal government. So the antenna is broadcasting the RF inches from the user's head.
Check the FCC regs if you actually want information and not the opinions of people to lazy to check the facts. The output Watts is also restricted by the FCC for these hand held radios.
The only way to get more power from a GMRS or VHF radio is to get a mobile unit that has a separate antenna. Then you can put the antenna higher and improve the range and at the same time have it further from people's heads.
Fortunately people put antennas higher to get more range without having to be bright enough to realize that there is a hazard in having RF output at head level, though this still happens from time to time with radar installations on private boats.
By the way the website is at www.fcc.gov for those who want to download the regs.