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Table 1 Study design

From: Initial puffing behaviors and subjective responses differ between an electronic nicotine delivery system and traditional cigarettes

STUDY DAY 1 2 3 4 5
LAB VISIT 1 2    3
Lab smoking – tobacco cigarette X     
Lab smoking – ENDS   X    X
Field smoking – tobacco cigarette X     
Field smoking – ENDS   X X X  
Breath X X    X
Saliva X     X
Urine X     X
Questionnaires X X    X
QSU (pre and post product use) X X    X
CES (post product use only) X X    X