Personal rights are very relative because we do not live in the world alone. When personal rights collide, there has to be an evaluation of the situation. It causes the user no harm to refrain from using a scented product. For those that have adverse reactions, such use can cause great harm. Perhaps the special interest is an industry that wishes to maintain the status quo and not have to account for the effects of the products it produces.
Certainly education is a very important aspect.
Before responsible use can be accomplished, responsible products must be available. Use of multiple scented products is encouraged by the industry making subtlety impossible. The same industry that says one's fragrance should not be detected more than an arm's length away produces products, which when used as directed, permeate a room for hours. Columnist Leah Mclaren claims she deliberately applied numerous fragranced products and went to the waiting area of Halifax Children's Hospital which had a fragrance ban. This children's hospital serves many asthmatics and others affected by fragrance chemicals.