Smoke is more than just a fragrance, it’s a particulant irritant. Ask any firefighter about smoke inhalation.
Much as I love fireplaces, campfires, BBQ’s, etc, I have to make sure I’m well upwind of them. It takes very little to start me coughing and short of breath. Scented candles are the worst because they have the fragrance as well.
I think that as we age, our lungs just aren’t as resilient as they used to be and that’s why so many people end up with so many problems later in life.
For all the derision that people with chemical sensitivities get from those without, those without don’t realize how fortunate they are and how much WE wish we didn’t have them either. Not being able to breath is NOT fun.