Subject: Why are aromatic compounds aromatic?

I understand that aroumatc compounds contain conjugated rings of carbons, and 
thatnot all conjugated rings are aromatic. I even understand that a conjugated 
ring with 4|n| + 2 pi electrons will be aromatic, and that in the double bond 
count for two pi electrons.
My understanding is that the ring compunds are particularly stable.
So thinking about the biology of smell, why are these rings more able to be 
sensed by the olfactory system than other airborne compounds?

Re: Why are aromatic compounds aromatic?