Smooth Surface and Decking Tests. Three burning cigarettes (well lighted but not burned more than 4mm (0.16 inch) shall be placed directly on a smooth surface location on the test furniture. The cigarettes should burn their full lengths on a smooth surface without burning across a tuft or stitching of a quilted area. However, if this is not possible because of furniture design, then the cigarettes shall be positioned on the furniture in a manner which will allow as much of the butt ends as possible to burn on smooth surfaces.