Inhalation of the aroma of a certified pure essential oil can be a powerful way to affect memory, hormones, and emotions through the olfactory system.  Anatomically, the olfactory system is closely connected to the limbic system of the brain.  The limbic system includes structures such as the hippocampus (long-term memory), the amygdala (emotions), the hypothalamus (autonomic nervous system and hormones),...