Carbon monoxide deliveries of cigarettes depend on many different factors, including the physical structure and chemical composition of cigarette paper, which in turn is affected by the amount of the pigment in paper, its morphology and chemical composition. Pigments are used in cigarette papers to improve visual appearance, opacity, color, porosity, ash appearance, etc. These inorganic pigments also enhance the porous three-dimensional structure of cigarette paper, which affects the transport of gaseous molecules such as oxygen and carbon monoxide, thereby influencing cigarette burn rate and deliveries. The amount of pigment in cigarette paper and its size and shape have a strong influence on the transport of carbon monoxide molecules between the combustion zone and the surroundings, that is, through the cigarette paper structure. Generally, using smaller pigments increases the overall rate of diffusion of carbon monoxide through cigarette paper.The chemical composition of the inorganic pigments can also impact carbon monoxide deliveries. Certain pigments, such as some iron oxides, enhance the conversion of carbon monoxide to carbon dioxide and therefore yield lower carbon monoxide deliveries relative to calcium carbonate, which is the dominant pigment used in cigarette papers. There are other pigments, such as certain clays, which yield higher carbon monoxide deliveries compared to calcium carbonates. This paper examines how the physical properties, amount of pigment, and its chemical composition affect carbon monoxide deliveries from mechanistic viewpoints, which are supported by experimental data.