How do you get cigarette smoke out of a pre-existing smoking home?

Clean: You clean. Then you clean again. Every surface. If there is carpet, change to wood or tile or get new carpet. Paint. Having the duct work cleaned can help. Cigarette smoke permeates every surface. Cleaning with a variety of cleaners is helpful. Chlorox containing cleaners seem to help a lot. Some of the odor will eventually dissipate, but initially the job is huge due to the cleaning.