I developed a fragrance sensitivity after my adult-onset asthma diagnosis last fall. After beginning Trelegy and montelukast, I developed the sensitivity to scents. Loss of voice, headache coughing to asthma attack. The next day I would sleep and not be hungry. This has increased each day. I now do Dupixent injections and stopped montelukast in hopes it will go away as it came. All things that bother me have parabens and phthalates in them. So it's not the scent, it's the chemicals that are toxic to me.