Did nothing for the smoke smell in my car.
Had a smoker in my car one time over a year ago and have been unable to shake the smell.  Gave these a last-ditch effort before buying a commercial ozone-generator.  If anything the smell was worse after having these in the car for a week or two.  Finally got a real ozone generator and it knocked 95% of the smell out in 30min.
Rating: 1 stars