I think we (and I mean our society, probably especially me) need to be better about sticking up for the right to not have to smell people beyond their personal bubble. As a person with allergies/asthma in a world where everything thing is fragranced and now double fragranced so it remains longer, I'm tired of having to get up and remove myself from life. There are times I have to get up and move several times at church before I can find a place I can sit, leave performances with assigned seating, etc. because of this. And that's in addition to the people and places I simply choose to avoid due to their right to have their smells in their own space.
There needs to be a general rule that when fragrance is strong enough to travel beyond your personal bubble it becomes an intrusion and simply isn't appropriate. I shouldn't smell anyone from several feet away and they shouldn't be able to smell me. You shouldn't constantly smell your neighbors from your own yard. (I say constantly because there are exceptions like lawn mowing, burning, etc. that just have odors that travel further at times.) It seems like common sense.
I always feel bad when people act like I'm expecting others to be fragrance free for life. I'm not. I'm asking them to respect others and keep it at a level that doesn't move beyond those they are intimate with. Your neighbor can stink up their home however they want, but when it is stinking up your space it's an infringement on your rights.
Talk to your neighbor. If this is some sort of one time treatment that will be brief, you can probably deal. If it is something they think is okay for normal life - they are just WRONG. However, they won't know it's an issue (because frankly, people are stupid) if you don't stick up for yourself.
PS - If we were close, I have a gas mask you could borrow so it would be safe for you to go over there.
