Cats usually do not have an odor but they can sometimes
Cats mostly rely on hearing, smelling, taste, and sight.
She's testing her scent. That 'smile' is really their way of smelling easier. Cats usually do this when smelling other cats bottoms or urine. They can get a lot of information about the cat they're smelling this way.
As cats are carnivores, foods such as meat will naturally smell good to cats. Fish and other strong smelling foods will also attract a cat. Cats have an acute sense of smell, and generally will be attracted to foods that are stronger-smelling than others.
To see if it tastes good
Well the leaves on some plants are known for their excellent smelling.
It might be because cats have a smelling pallet on the inside of they're mouth right behind the upper lip and under the nose.
Siamese cats smell like a mustelid because their anal glands secrete a strong smelling musk.
Man
Are cats 'burning in' ?
Cats and kittens are cute and lovable. They are excellent subjects for youtube videos. They can catch mice.
Big cats and house cats have excellent night vision. Their vision is many times superior to the human and the dog.
Swat cats was the name of the series. An excellent show if I do say so myself :)