Just to set the record straight, many that are negatively impacted by fragrance do not have Multiple Chemical Sensitivity. They have asthma, allergies, migraines, and chronic lung disease. While perfumes and fragrances are certainly odorants, the chemicals that make up these products have other properties besides odor. The vast majority of fragrances are respiratory irritants. They add to indoor air pollution and are a serious problem for those with respiratory problems.
Freedom is a two sided issue.
I support the right of anyone to smoke, use fragrance, etc. I also support the rights of those that do not wish to use these products not to. Although I don't imply personal bad faith on your side, I still believe that this kind of reaction is not just plain hysterical, but it is part of a selective hypochondria that truly plagues our times. Like too many, you are mentioning all that chemical terminology, which is meant to scare people who are ignorant in chemistry into mistrust and apprehension that, of course, leads to a sympathetic posture towards prohibition, regulation, and control. Another example is the radiations from cellular phones.