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The use of SPDEVID and PTREFID in this example on records where PTSPEC=AEROSOL indicates that a smoking machine (SPDEVID) was used to perform a smoking regimen (PTREFID) to produce the aerosol from the e-liquid product. Smoking Details of the smoking machine and smoking regimen data are not shown here. For an example examples illustrating how to represent these concepts in SDTM, see Section 3.1.3.1, Harmful and Potentially Harmful Constituents (HPHCs) and Smoking Regimens.