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The same stuff is going into your lungs ... it is most likely the crap rising to the ceiling. I worked at a car wash for a while a couple of years ago. I would deliberately avoid a smoker's car. The residue on the windows take forever to get off.
All the Anti smoking aside----First, Open a window Dude, Second, there is a product I use that works for lots of things called Tuff Stuff in a large Yellow spray can. Its a Car Carpet cleaner---WalMart and most auto places sell it
when i bought my z, it had a little stain on the headliner by the drivers window. i used oxy-clean and it worked great, now you can't even tell it was there .......just make sure you dab, dont rub