As an important distinction the current millimeter scanners at the airport are completely uncomparable. They use non-ionizing radiation similar to Wi-Fi. There

As an important distinction the current millimeter scanners at the airport are completely uncomparable. They use non-ionizing radiation similar to Wi-Fi. There used to be backscatter x-ray scanners (ionizing radiation) but these were decommissioned in the EU/US in 2012/2013 due to public concern even though the levels were low as well. The importance of the distinction is a lifetime of non-ionizing radiation is not known to cause any adverse effects while any instance of ionizing radiation is known to damage cells, even when it's a low amount in a controlled area. The debate people have with the former is whether or not it might even causes a problem in the first place while the debate with the later is where the best balance on the damages vs advantages is.