But what happens to your sense of smell if you have trouble with emotions?
The researchers found that individuals with medium-to-high levels of alexithymia* showed a greater physiological response to the odors— their heart rates sped up and skin conductance increased — compared with individuals with low levels of alexithymia.
— Read more at What Your Nose Can Reveal About Your Emotions at LiveScience.
* From Wikipedia: "Alexithymia is a personality construct characterized by the subclinical inability to identify and describe emotions in the self. The core characteristics of alexithymia are marked dysfunction in emotional awareness, social attachment, and interpersonal relating."