I was wrong on the prices unless they've gone up a little. The warrany on the filter is 5 years also not 3.
I have the Austin Air Healthmate.
STAGE 1: Pre-Filter (Large Particles)
Removal of large particles such as hair, dust, pet dander
STAGE 2: Pre-Filter (Medium Particles)
Removal of medium-sized particles such as pollen, spores, mold
STAGE 3: Activated Carbon (6.5 pounds - Zeolite Blend)
Removal of gases, odors, and chemicals
STAGE 4: HEPA Filter (Medical Grade 30 Square Feet)
Removal of micro-organisms such as viruses and bacteria
This a great all around filter though I mainly use it in the room I sleep in to remove dust. It moves a lot of air. moving the air is gonna be key to removing smoke from large rooms. You might get away with a smaller unit that runs all day with fans placed around the room. Do you currently have central heating or air? Then it would just be a matter of a finer filter. I think charcoal is the key to removing smoke though. Also eliminating its paths into the home.
And air purifying respirator might be useful as well. That filters air and blows it around your nose.