I have spoken about the health hazards of smart meters (that the electric companies are putting on your homes so they can sell information to marketers) because they put out much more EMF than other devices. However, other devices can add up. While I have personally seen two cases of severe illness 3 weeks after smart meters were installed, I have not made a direct correlation with getting a cell phone, etc.
If interested, this site gives pictures of EMF emitters with suggested replacements or strategies to lessen the damage. Like suggesting you buy locally raised, sustainably farmed meat and vegetables, I suggest to take some steps to decrease EMF.