Table 1.

Cigarette, E-cigarette, and Total Consumption^a among Dual E-cigarette/Cigarette Users (n = 64)^b

Categories	Baseline mean (SD)	Week 6 mean (SD)	Δ (Week 6–BL) Mean (SD)	p-value
Cigarettes,past 7 days	84.7 (56.3)	14.7 (23.2)	−70.0 (54.1)	< .001
E-cigarettes,past 7 daysc		75.7 (62.1)
Total consumption in cigequivalents (cig + e-cig)		90.5 (61.0)	5.8 (69.3)	.51
Rate of substitution from cig to e-cigd		79% (29%)

^a Calculated as the number of cigarettes reported in the previous week in the Timeline Follow-Back plus the cigarette equivalent in e-cigarette pods (one JUUL pod = 20 cigarettes, one pod = .57g) returned at the visit

^b Of the 114 participants in the e-cigarette group that completed the week 6 visit (60 in KC, 54 in SD), 64 qualified as dual CC-EC users (35 in KC, 29 in SD) and were categorized separately from e-cigarette only and cigarette only participants at week 6

^c Represented as cig equivalents. Participants returned JUUL pods at each follow-up visit. Returned pods were weighed and summed to derive the total grams of e-liquid consumed. From this, a calculation (one pod = .57 grams and is equivalent to 20 cigarettes) was applied to convert grams of e-liquid consumed into cigarette equivalents. 100% of pods distributed were returned

^d Rate of substitution from cigarettes to e-cigarettes (i.e., conversion rate) represents the proportion of cigarettes that were replaced by e-cigarettes at Week 6, or in other words, the total proportion of total cigarette equivalents made up of e-cigarettes. For example, a conversion rate of 79% means that for dual users overall, 79% of their total consumption at Week 6 was derived from e-cigarettes