Air Purifiers

We have someone in our house that smokes constantly. The air is always thick with it and she will not go outside or respect us (who do not smoke) in any way by cutting back or going outside. Actually if she did go outside she may never come in except to maybe go to the bathroom or sleep. That’s how much she smokes.

She has no intentions of quitting and has been quite vocal that she "will not quit simply because you want me to!" <== her words almost exactly.

So we’ve given in and decided that the best thing for our health is to try to buy an expensive air purifier/filter. But which one will help the best and take in and filter as much smoke as she puts out?
Edit details:

Home is a single floor home with an open-floor design. No matter where you go the smoke permates throughout…eventually.
Edit 2: It’s not so much that she doesn’t know. She honestly just doesn’t CARE.

What is the best air purifier for removal of dust and odor? I have been looking at ebay and is almost convinced on buying ecoquest (with hepa, uv, ionizer, and ozone generator). The only thing that still prevents me fom buying this (9) is the ozone generator which can induce asthma. I am an asthmatic. Anyone with a good experience with a VERY GOOD air purifier? I can only afford <0 and does not consume much electricity, with low maintenance. Thanks.