I once fixed a computer in a woman's house, and she was a double chain smoker. She had at least two going at any time. The walls were yellow brown with the smoke, and when I opened her computer I could not believe it was still working at all. It looked like it had been filled, not just some layers, totally filled with brown cotton candy.
When I got home, I left my clothes outside, went directly to the shower, and then went back and washed my clothes outside with the garden hose before I would bring them in the house. Yes, the smell was that strong.