CBNRE (Chemical, Biological, Nuclear, Radiation, Explosive) considerations are part of my preps and have been from the very beginning, starting in 1967. While the probability of GTW (Global Thermonuclear War) is slightly less than it once was (though I think that will go back up soon), the probability of lone wolf attacks with small nuclear weapons and radiation devices is up there now.
The primary additions to 'regular' preps for NRE part of CBNRE are radiation and blast sheltering, metering, and air filtration. The sheltering is relatively easy to achieve, and does not cost all that much, if a person has an appropriate location. Plus, there are existing adequate sheltering locations in this area that can be used if one learns where they are, and is willing to run a bit of risk to use them. The air filters can be home made fairly economically, or purchased, which can be expensive. Meters can be expensive, but there are some low cost options out there.
The CB part of the preps, requiring additional preps is a subject for another thread.
Just my opinion.