We don't want anyone to get even a faint whiff of what's going on.

A faint whiff of the smoke had reached his nostrils.

He smelled a faint whiff of perfume as she moved away.

And to be fair to him, as with many things involving the Giants, there is a faint whiff of politics here.

There was a faint whiff of must coming from the closet.

He caught a faint whiff of some scent she was wearing.

There was a faint whiff of old cigar smoke in the air.

A faint whiff of the smoky heat the Others had.

Ten steps more, and the faint whiff of smoke came to his nose.

There was a faint whiff of a dog about the place, also.