The fact that we talk about smelly feet demonstrates that our sense of smell can affect our behavior. Talking about the smell may not be the most important affect it has on our behavior, but it demonstrates the potential.We talk about smelly feet too. Talking about it means nothing, I have no idea what you are trying to say about the significance of talking about it.
Since no one really challenges the functionality of smelling, demonstrating such a small affect of smelling is not important. But many people do get to the point on wondering whether consciousness is really doing something - if it is really causing anything to happen with us. So highlighting this trivial example of an affect on behavior establishes that consciousness has at least a minimal influence.