Olfactory Sense, Smell sense SI , Calming smell to soothe or relax 

The olfactory system, or the system that enables the sense of smell, has receptors in the tissue of the nose that are connected by pathways to the brain. Connections occur via two pathways, one being a direct route to neurons in the brains and the second being a path that passes near the roof of the mouth. This channel is connected to the taste of foods
There is some evidence indicating that the sense of smell is more associated with memory than the sense of vision or the other senses. The connection of the olfactory sense to the emotional part of the brain and previous experiences, as well as hypersensitivity or hyposensitivity to smells can cause anxiety or sensory related breakdowns in children with sensory processing difficulties