With all the forest fire smoke in the air around where I live, I decided to replace the cabin air filter with a HEPA one to see if it helps any. The air quality is only "Very Unhealthy" today, a vast improvement over yesterday, so it's a little difficult to tell, but it does seem to help pull the smoke smell out of the air in the car. So, I figured I'd post the filter I used here, in case it helps anyone else.
I ended up with a Bosch 6043C, and followed these YouTube instructions to replace it. If you haven't replaced one of these filters before, I strongly suggest watching moomoo97's video. That air filter is a pain to get to and replace, and his instructions walk you through it step by frustrating step.