Question

The purpose of using scents in stores and malls

Answer 1

It keeps public places from smelling bad. Some people don't have good hygiene and smell bad.
A business that smelled bad wouldn't do well. At some point people would stop going to that business and the business would shut down due to the lack of customers.

Answer 2

TO MAKE IT APPEALING SO THAT MORE PEOPLE WILL COME TO THERE STORE MORE OFTEN BASICALLY FOR MONEY