An article on the website of Stop Smart Meters UK reports that a patent for a device to reduce exposure the the pulsed microwave radiation (such as is produced by Wi-Fi routers) states that this type of radiation is “genotoxic” i.e. it causes damage to DNA.
You can read the full story at this link:
Editor’s comment: Like mobile phones,”smart meters” are also a source of microwave radiation. (How much radiation exposure is caused by a “smart meter” varies in relation to the make and model of the meter and the location of the meter in/on a home or building, among other factors.)