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This is a study were where subjects were randomized to use 3 different concentration concentrations of nicotine e-nicotine liquid, or their usual brand of cigarettes. The subject subjects used the product at home for 2 weeks. This 2-week period allowed subjects to become familiar with the e-cigarette. After two 2 weeks, the subjects were confined to the clinical clinic for one 1 day. They were required to not use any  e-cigarettes any tobacco products for 12 hours prior to the visit. Subjects had to have CO level levels below a pre-specified prespecified level , to attend the visit.   If the level , was too high, the visit was re-scheduledrescheduled. Subjects were instructed to take 10 puffs on the e-cigarette/usual brand of cigarettes in the morning and afternoon.   Puff topography was measured in the morning and afternoon using the same device for all subjects.   Subjects were not allowed to use any tobacco products between the morning and afternoon sessions. 

A  Device Identifiers (DI), a Study Reference domain, DI, was used to identify the device used to measure puff topography.   The provide This provides a consistent sponsor-defined variable (SPDEVID) for linking data. Device Because device identifiers exist independently from subjects; therefore, the DI domain does not contain USUBJID. Only one 1 device was used for all subjects in the study. 

The sponsor applicant submitted the EX domain to represent the usage of the e-cigarettes. For each subject, the usage for the two weeks are represented, and then the specified usage Exposure (EX) domain to represent use of the tobacco product. Usage for the 2-week period is represented for each subject, along with the specified use during the in-clinic visit are shown. The sponsor applicant elected not to represent each puff in this EX dataset. Each Puff , although each puff could have been recorded.