Whiff (noun)

1. A light gust of wind or breath.
2. A slight smell or hint of something.
3. A brief or momentary experience of something.

Origin:

From the old english word "hwiff" meaning "breath" or "scen.t"

Examples:

1. I caught a whiff of perfume as she passed by.
2. He took a whiff of the fresh air.
3. She caught a whiff of something burning.
4. I got a whiff of success and knew I had to grab it.
5. He caught a whiff of smoke and knew something was wrong.