What work best to get cigarette smell out of used car?

Sorry, I should have elaborated more. If you rent a carpet cleaner, or if you already own one, use the cleaning solution that is made for the carpet cleaner. (they are all pretty much the same) Walmart has one in their brand that is specifically made for pets and smoke smells. I bought that cleaner and filled the MAX LINE halfway with cleaner, and the other half with white vinegar. I had to do this about 3 times, because I used the hand held part of the carpet cleaner to really get up in there. Lol. After I left the doors open during the day, and before closing everything up, I put a few boxes of baking soda in the car. I opened the entire box on the top, rather than just using the push in hole. I made sure to put them both in a place where they would not tip over, and literally left them in there for a month. It worked well. And in my opinion was worth every second. LMK how it turns out. =D Best regards~ Ireland