The nose is the shortest pathway to the brain.
Smells go right into the limbic system.
Remember that buying decisions are made on an unconscious level first.
You can use aromas to influence purchases and to brand your company. Singapore airlines for example uses a specific arom as perfume in all flight attendants, in their hot towels and in other elements in their service.
Again think how you can market to all five senses but don’t forget the nose.