Do you smell things that aren't really there

It's your limbic system. Your smell detectors are just around the memory stockage. So you can have a memory when you smell something and you can feel the smell when you remember something.

I do, and I see shadows and hear distant noises up.close.

Yes. They just did a study on this.

No my sense of smell isn't that good

Sometimes

sometimes i can remember something and feel the smell