Radio frequency (RF) emitted by advanced meters is well below the limits set by the Federal Communications Commission and it is below levels produced by other common household devices like cell phones, baby monitors, satellite TVs, and microwaves. You would have to be exposed to the RF from a smart meter for 375 years to get a dose equivalent to that of one year of 15-minutes-per-day cell phone use.
Read more about safety and advanced meters here.