I remember reading "the nose knows" (The Healthy Home), and it is true! With all of the endless manmade chemicals entering the environment our senses become immune to them with use and proximity. Just like our powerful/delicate palates, the nose's ability is compromised around compromising ingredients! The author advises to trust our noses, and if it is smelling danger it is dangerous!
I used to be a "normal" consumer of chemical-filled products and foods. I would not have known what I was talking about if I told myself what I just wrote! My nose no longer worked! I would walk around the stores and malls (and schools/hospitals/etc!) not noticing a thing! NOW living free of chemical-filled products and no longer going to stores, if I do enter a store, I want to spit! I can TASTE the poisonous fumes! I've become "chemically sensitive" (i.e. my nose works again and it is saying "GET AWAY FROM THE DANGER PLEASE NOW!!!!!!!).