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All three datasets make use of the SPTOBID variable to 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., two different manufacturers supplied the same ingredient, each with different purities, that is used in two different components of the product ), STRFID must be unique for each use to reflect this difference, even if they share the same common name, IUPAC name and CAS number.  (see note 5)

The IT example below shows 4 types of tobacco listed as tobacco ingredients (STRFID) for the Tobacco Product CIG01A (SPTOBID). The variable ITSPECIF shows the specification (variety) of the first three tobaccos. ITCAT is used to indicate that Reconstituted Tobacco is a complex, purchased ingredient. ITCURMTH indicates the cure method. ITCPISP is used to indicate whether complex purchased ingredients were made to the applicant's specification. TMRF indicates the Tobacco Master Reference File. (See note 2)

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