Multiple chemical sensitivity (MCS) is characterized by somatic distress upon exposure to odors. Patients with MCS process odors differently from controls. This odor-processing may be associated with activation in the prefrontal area connecting to the anterior cingulate cortex. which has been suggested as an area of odorant-related activation in MCS patients. https://www.helpmesdicalsuppliers.shop/product-category/cpap-mask-headgear/