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• Tobacco Ingredients (IT) is used for listing representing the tobacco ingredients and their attributes within the tobacco product under study.
• Non-tobacco Ingredients (IN) is used for listing representing other ingredients and /additives and their attributes as used in the tobacco product under study.
• Ingredients Quantified (IQ) is used for representing the quantity of each ingredient (both tobacco and non-tobacco) by component of the tobacco product in which they are included. These values represent the design/formulation specification of the product, not experimentally determined values (as the latter would be represented in the Product Testing (PT) dataset, not shown here). (see note 1 – need to confirm this is true)

All three datasets make use of the SPTOBID variable to represent identify the tobacco product under study, and the STRFID (Substance Reference Identifier) variable to represent the ingredient name. STRFID must be assigned by study sponsors to be unique with regard to the attributes that describe it. If, for instance, the same ingredient varies on one or more attribute (e.g., a two different manufacturer supplied a compound manufacturers supplied the same ingredient, each with different purities, that is used in one component two different components of the product than the same ingredient used in another component ), STRFID must be unique for each use to reflect this difference, even if they share the same common name, IUPAC name and CAS number. 

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