it smells good.
hydrosulphuric acid
Cyanide, although it smells of almonds only about two thirds of people can smell it.
I think it smells different than when it was introduced.
because of eating garlic?
I wouldn't quite know what rotted pears smells like, but anytime you have something rotten smelling and you can't find the source... you might think about something having died either in your walls, or under your house. Have you set out some bait for pests?
Arsenic or rat poison as it more commonly know smells like bitter almonds. I found this out from the great Edgar Allen Poe :)
The plural of pear is pears.
Cyanide
He was actually hit by mustard gas (a poison gas that smells like mustard) near the end of World War I. The war ended while he was still in a hospital recovering from the poison.
You can tell if he is acting weird ,and is making this weird food or something in a pot or something, and you can tell if it smells weird. Not all poison has taste or smell. If you think some-one is trying to poison you, dont let them near anything you are going to consum.
Wilson Ant Out ant traps use poison in order to kill the ants. This poison may not be safe to leave out around your pets, as they might eat it and become sick, especially if the poison contains smells meant to attract the ants.