Neighbour smokes like a chimney?

Ok so here’ my problem. My neighbour is insane, I really think she belongs in an institution of some sort. I can probably write a book about her but that’s not the point of this post. She smokes like crazy, probably 3 packs a day… I don’t know I’m just guessing but the problem is that I smell it all the time. Sometimes I can see her smoking out her window which you’d think would be a good thing, but I can visually see the cloud of smoke rolling it’s way into my window. So much for getting fresh air in the apartment.

I should also mention that I live in France and the building was probably built 500 years ago, so ventilation is not very good. Insulation is not very good.

I would try talking to her but that’s not really an option since she’s incoherent most of the time. Yes I was serious when I said she should be in an institution. People often think I’m just exaggerating and blowing things out of proportion yet as soon as they come over they agree with me that she’s nuts.

So I’ve been thinking about getting one of those air purifier/filters (with a hepa filter). Although I’m wondering if it would require good insultation to actually do anything, or if it will help at all. The apartment is not very well insulated, and there’s no A/C so I generally want the windows open (French people are scared of air conditioning… sucks for me). Any other suggestions on how to deal with this situation would be great. I am considering moving but until that happens… Thanks.
In response to the "if it’s only the smoke answer", it’s not… like I said I could write a book. But moving is definitely something I’m thinking about.