Rehabbing smoker house

[John Daniels]

Hi All,

I have a house to rehab that is 1600 sqft and the occupants were heavy smokers.  Walls look yellow and kitchen and dining room are wood panelling.  I have been reading through the post here about rehabbing a smoker house but these post are very dated... 

Is there any new method of dealing with smoker rehab house today?  

Shellac still viable or is there something better now?

What is the success rate of just covering up with shellac and paint?

The walls have texture and I think a flat smooth surface is more desirable, will a skim coat of mud over shellac'd wall work?

Will 1/4" sheetrock over plywood work to block smoke?

Thanks