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In this study, subjects were randomized to either nicotine replacement patches or ENDs device which used e ENDS devices using e-nicotine liquid cartridges. In order to maintain the blind, subjects used both the nicotine replacement patches and the ENDS devicedevices. Subjects were requested not to smoke, but the number of regular cigarettes used were collected. Subject were seen every day for 15 days. The nicotine patch was applied, at rotating sites, and the ENDS cartridge was replaced every day. The cartridge was weighed when dispensed and upon return. On days, 1, 5, 10 subjects remained in the clinic for 4 hours for collection of biomarkers.  On these days, a new ENDS cartridge device was inserted and then used for 10 minutes, and then not used for 4 hoursthe remaining collection period. A new cartridge was insert inserted at the end of the 4 hourshour collection period.  The  patch was applied prior to using the ENDS device on these days.     

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In this study, the weight of the contents in the cartridges were cartridge was tracked.  A Product Accountability (DA) domain was submitted to represent dispensed and returned weights of each cartridge.  Only a few rows are shown. The produt accountability information was not provided for the nicotine replaement patches.    

EC was used to represent the collected exposure data since a double dummy design was used. ,while the The EX domain was used to represent the subject's exposure to the actual product containing nicotine. The sponsor represented each cartridge used. The dose was represented has as "1" to indicate only one cartidge or patch wsa used. The actual date and time of usage of the cartridge was recorded precisely on days 1, 5, and 10, while only the date of usage was reccorded on other days.           

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