How could I recognize a scent I'd never smelled before, you ask?

Barbara Brown had smelled like food before, but now that first flush of adrenaline kicked through her system.

It was the same decaying-meat stink she had smelled before.

Air, which he had never smelled before, flowed quietly around him.

It was surprising squatters hadn't smelled out the place before.

A rich, complex odor, nothing like any of them had smelled before.

But this smell was something new, something unlike anything he had smelled before.

Oddly, he had never really paid that much attention to how this room had smelled before.

The place did stink, though, like nothing I'd ever smelled before, but it wasn't any sort of gas to affect the budgie or me.

There was a stink she had never smelled before, sharp in her nose and scary.