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The following examples illustrate how the ingredients of a tobacco product would be represented and quantified using three datasets:

• Tobacco Ingredients (IT) is used for representing the tobacco ingredients and their attributes within the tobacco product under study.
• Non-tobacco Ingredients (IN) is used for representing other ingredients/additives and their attributes as used in the tobacco product under study.
• Ingredient Quantities by Component (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).

All three datasets make use of the SPTOBID variable to identify the tobacco product under study, and the IGDCMPID (ingredient or component identifier) variable to represent the ingredient name. IGDCMPID 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., two different manufacturers supplied the same ingredient, each with different purities, that is used in two different components of the product), IGDCMPID must be unique for each use to reflect this difference, even if they share the same common name, and/or the same IUPAC name and CAS number. See IT example which illustrates this below.

The IT example below shows tobacco filler and the 4 types of tobacco of which it is comprised listed as tobacco ingredients (IGDCMPID) for the Tobacco Product CIG01A (SPTOBID). The variable ITSPECIF shows the specification (variety) of the first three tobaccos. ITIGDPLX is used to indicate that Reconstituted Tobacco is a complex ingredient. (it has two more components) ITCURMTH indicates the cure method. ITSPFL is used to indicate whether complex ingredients were made to the applicant's specification. TPMF indicates the Tobacco Product Master File. Note that there are two varieties of burley tobacco in this tobacco product, thus each is given a unique IGDCMPID value (Burley Tobacco and Burley Tobacco 2).
Note that following the team discussion on 12/13/22, we have added tobacco filler to the IT dataset below, so that all values of IGDCMPID in the IQ dataset have a match in IT (just as the top-level non-tobacco ingredients "FSC Paper B" and "Cellulose Filter A" are listed in the IN dataset). This allows for validation checks that every ingredient listed in the IT and IN datasets is quantified in the IQ data and vice versa. See note 4 in the comments section at the bottom of the page for more info

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