sensitive to smell

I kind of understand his situation. I noticed recently that I'm sensitive to smell. I still think of normal things that stink but I find almost all of perfumes or colognes either make me sneeze or want to vomit especially those people who thinks putting a ton of perfumes/colognes is okay. I think they don't smell the scent anymore and this cause a lot of problems for other people because the scent is too strong. And worse is that the scent doesn't disappear even hours after the person leaves the room. T_T