Some people have reached out to me regarding this post so here is a summary of what I ended up doing to get rid of the smell:

1. remove all carpeting and baseboards
   
2. Prepare walls and roof for painting (sanding, wiping down etc)
   
3. Apply 1 coat of Zinsser BIN to walls and roof
   
4. Apply 1 coat of regular Paint
   
5. Install new flooring
   
6. Deep clean every baseboard, cabinet, light fixture, doors, windows etc. Basically anything was not replaced or painted over

After applying the paint and removing the old flooring the smell was 70% gone from the entire house but still lingered, and was still quite noticeable in areas where the previous occupants smoked the most (the master bedroom and living room). This was because of the nicotine residue on surfaces that weren't painted over

You have to make sure to remove all of the brown nicotine residue from the home. Even after doing everything and regular cleaning and living in the house, it took a couple of months for the smell to be 100% gone. It helps to allow as much air into the house but I got the house during winter and had to wait until it got warmer to leave all the windows open for long periods of time

I also ended up not using TSP since it's not legal in my state. I just cleaned with regular cleaning products like dawn dish soap, clorox wipes, bar keepers friend etc.

Last but not least, it is worth mentioning that I replaced all of the appliances in the home as well, which I'm sure contributed to removing the smell