from constant exposure???
There's dust everywhere including in the air, so we're exposed to it 24/7. Does it kill us immediately? Apparently not since we're all still alive. But does it kill us over time? Hmm...I'd have to say not exactly... You may be able to get COPD if you breathed a lot in all the time (and COPD has the possibility of killing you), but I'd also say that maybe dust PLUS other things like bad air pollution and/or other stuff could kill you...
Ur body will get used to it but if u get to much it can kill u over time