This is an interesting thread. Like Cee Zee, I have always had a really good, if not overactive, sense of smell. Blood was one of the first things that popped into my mind. I can pick up that heavy iron smell from several feet away. The silverware tasting has always been a big problem for me. Some of the really cheap stuff is almost like putting tin foil on my old composite cavity fillings. Luckily, I don't find any of the firearm related smells offensive but I know exactly what the O.P. is talking about.
I worked in the CNC world for a lot of years as well and I could always tell what was being cut in the shop by the smell. It didn't matter if it was metal or polymer either. Things like phenolic are so disgustingly strong to me that they are downright uncomfortable to work with. For the longest time, I thought this was normal until I talked about it with some other people there in the shop and they thought I was nuts.
People who don't experience this think it is in your head. My own family didn't really buy into it until they found out that I can find wasp nests by smell. Now, I get called over to sniff them out. To me, I can't understand why everyone else can't smell the things.