Table 2.

Examples of Patented Innovations to Improve Smoke Odor From Cigarettes

Site	Strategy and exemplar quotations:
Number of patents identified (n = 26)
Paper	Perfumes to improve odors: “A method of fixing a perfume for improving the odor of a secondary smoke issuing from a cigarette. The method comprises: applying to a cigarette paper a secondary-cigarette-smoke-odor improver obtained by adding an ethanol or propylene glycol solution of the perfume to an ethylene/vinyl acetate copolymer emulsion which has a solid content of 10 to 60 wt.% and in which the copolymer has an ethylene unit content of 30 wt.% or lower; and drying the paper to fix the perfume to the paper. The perfume solution in ethanol… the perfume solution in propylene glycol….” (Miyauchi, Nagae, Tanabe, & Nakano, 2001)
	Wrapper material permeability and flavour to alter odor: “The present invention relates to a smoking article comprising two layers of wrapper material, the outer wrapper having an air permeability of at least 200 C.U. and having a greater permeability than the inner wrapper. Encapsulated flavour is held between the inner and outer wrappers. The encapsulation technique is dependent upon the flavour to be encapsulated and the sidestream to mainstream flavour delivery ratio required. Sidestream smoke may be altered without altering the mainstream smoke, thereby altering room odours.” (Woods, 2004)
	Deodorizers and masking “…mandarin orange essential oil fraction having terpene hydrocarbons … is effective for eliminating the tobacco odor, and … is capable of masking the tobacco odor…. It is possible to coat the tip paper or a filter wrapper paper sheet with the sidestream smoke odor reducing agent of the present invention.” (Higashi et al., 2004)
Filter capsule	Neutralizing or masking of smoke smell: “This invention relates to the provision in a cigarette filter element of a capsule containing a deodorizer. The capsule is resistant to the handling endured before and during smoking, yet ruptures to release or expose the deodorizer upon extinguishing of the smoked cigarette. The deodorizer may comprise neutralizing or masking agents, or mixtures of both.” (MacAdam, O’Reilly, & Warren, 2007)
Multi-site	Regulator to reduce disagreeable smell: “A regulator for smoking flavor of tobacco comprising ascorbic acid, a salt or isomer thereof, and a chlorophyll-containing material, wherein a herb or a citrus fruit is further incorporated therein. The regulator can reduce the amount of tar and nicotine contained in tobacco smoke, can reduce a disagreeable smell or a pungent smell emitted at the time of smoking, such as an odor of nicotine, and can impart novel flavor to tobacco. It may be used in a state attached to the tip of tobacco, such as cigarette, or in a state mixed in shredded tobacco leaves.” (Ohshiro, 1999)
	Vanillin: “There have been made numerous proposals for the incorporation in smoking articles, cigarettes for example, of compounds which effect a modification in the sensory perception pertaining to the mainstream and/or the sidestream smoke of the smoking articles. An agent commonly proposed for use as a smoke modifying agent is vanillin… The subject invention provides a method of modifying a smoking article, wherein vanillin glycoside is incorporated in a smoking article… In accordance with the subject invention the vanillin glycoside may be incorporated with one or more of: smoking material, wrapping material, filter material and wrapper adhesive.… The so released volatile vanillin is then effective to aromatise the mainstream and/or sidestream smoke of the smoking article.” (Dowle, 1997)