your thinking to much:tinfoil:
if it bothers you to much put on a mask.as far as being harmed,I dont think an hour or two every couple of weeks of breathing the smoke will hurt.your home has far more bad fumes than you gun range,you just dont know it till you start tearing down walls and such.homes can have lead,asbestos tiles,asbestos insulation,fiberglas insulation(a bad irritant)vermiculite insulation(a fire proof coating in some insulation)everyones fear of mold,and enough dust to fill a stadium,and the list goes on,and on....
like i said you dont know whats there untill a home is renovated,and walls start coming down.
if your scared of the breathing quality at the range,just look at the people that work there.there all fine,and have kids!