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All 3 datasets use 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 applicants to be unique with regard to the attributes that describe it. For instance, if the same ingredient varies on 1 or more attribute (e.g., 2 different manufacturers supplied the same ingredient that is used in 2 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 registry number. See IT dataset example, which illustrates this, below.

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