Hello!
I have just bought an apartment that is smoke-infested, and I thought it would be easy to fix with some stain-blocking paint and other fun stuff.
But now that I'm about to really tackle the problem, I have some questions.

Option 1:
Fill holes, sand, wash, and paint over the existing wallpaper with stain-blocking paint.

Option 2:
Remove wallpaper until I reach the concrete, apply joint compound broadly, sand, apply joint compound, sand, wash, paint with stain-blocking paint.

Option 3:
Wash and paint with stain-blocking paint.

The only thing I'm wondering about is if I remove the wallpaper, do I have to apply joint compound broadly? If not, do I really need the stain-blocking paint? (does nicotine stick to concrete?)

Option 1 feels like I'm just painting over the problem instead of removing it.
Some walls are smooth while others have only one bulge that sticks out about 1 mm.

Grateful for all the help and answers! I'm feeling so confused.
Note! I've only painted walls before, so I have no experience with applying joint compound broadly.
 
A couple of bowls of vinegar or an ozone machine running for a few days should remove the smoke smell. Just remember that when using ozone machines, no one should be in the apartment while it is running. Afterward, it should be aired out properly before anyone can stay there.
 
I'm just an amateur, but here's what I did in our smoke-soaked kitchen: Removed loose wallpaper, painted with cheap primer (I bought it at Rusta), filled in all the uneven areas (wallpaper seams, screw holes, etc.), wallpapered with wallpaper. I didn't use any special barrier paint, but it depends on whether you are going to paint your walls or wallpaper them.

If you are going to paint the ceiling, wash it with cleaner first.

I think it will be more work to remove all the wallpaper. Then you really need to fill it in completely, as concrete is too uneven to paint on.
 
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