Essential oils have a major effect in heightened emotional states such as grief and sadness. They have a strong connection to our emotional wellbeing. The olfactory system includes anything in our body that affects our sense of smell. During inhalation the olfactory system can detect molecules, identify millions of odorants and remember them. When inhalation takes place, these tiny molecules passes through the membranes and into the blood stream. The trigger signal is sent to the limbic system and the amygdale in the brain. This part of the brain stores and releases emotional trauma. The only way to stimulate this gland is with the sense of smell. This is also known.