TABLE 3.

Hazard ratios (HRs) and confidence intervals (CIs) for current and ever ENDS use, and for socio-demographic, intrapersonal, and interpersonal covariates predicting transitions in three states of cigarette use (never, current/past 30-day, and non-current)

		Hazard Ratios (95 % CI)
Exposure Variables and Covariates	Transitions	Unadjusted Modelsa	Adjusted Model
Past 30-day ENDS use	Never to Current Use	4.56 (3.51-5.91)	2.69 (1.95-3.72)
	Current to Non-Current Use	0.86 (0.77-0.96)	0.63 (0.53-0.75)
	Non-Current to Current Use	2.25 (1.94-2.60)	1.92 (1.50-2.45)
Ever ENDS Use	Never to Current Use	2.32 (1.95-2.76)	2.16 (1.79-2.62)
	Current to Non-Current Use	0.86 (0.78-0.95)	0.54 (0.47-0.63)
	Non-Current to Current Use	0.88 (0.77-1.00)	1.14 (0.92-1.40)
Male Sex	Never to Current Use		1.17 (0.98-1.41)
	Current to Non-Current Use		0.82 (0.73-0.92)
	Non-Current to Current Use		1.21 (1.05-1.40)
Baseline Age	Never to Current Use		0.96 (0.91-1.02)
	Current to Non-Current Use		0.93 (0.91-0.95)
	Non-Current to Current Use		0.94 (0.92-0.97)
Hispanic	Never to Current Use		1.23 (0.98-1.53)
	Current to Non-Current Use		1.14 (1.00-1.29)
	Non-Current to Current Use		1.04 (0.89-1.21)
African-American/Black	Never to Current Use		0.88 (0.63-1.22)
	Current to Non-Current Use		1.16 (0.91-1.48)
	Non-Current to Current Use		0.48 (0.34-0.69)
Asian-American	Never to Current Use		0.98 (0.77-1.25)
	Current to Non-Current Use		1.32 (1.10-1.58)
	Non-Current to Current Use		1.03 (0.82-1.29)
Other race or ethnicity	Never to Current Use		0.91 (0.64-1.30)
	Current to Non-Current Use		1.00 (0.81-1.24)
	Non-Current to Current Use		0.86 (0.66-1.12)
Four-year college	Never to Current Use		1.22 (0.83-1.81)
	Current to Non-Current Use		1.05 (0.85-1.30)
	Non-Current to Current Use		1.00 (0.78-1.29)
# of other products used	Never to Current Use		2.13 (1.80-2.52)
	Current to Non-Current Use		0.96 (0.88-1.05)
	Non-Current to Current Use		1.60 (1.43-1.79)
Nicotine dependence	Never to Current Use		0.97 (0.23-4.11)
	Current to Non-Current Use		0.42 (0.34-0.53)
	Non-Current to Current Use		0.88 (0.60-1.29)
Sensation seeking	Never to Current Use		1.22 (1.10-1.35)
	Current to Non-Current Use		1.07 (1.01-1.14)
	Non-Current Use to Current		1.17 (1.08-1.27)
Depressive symptoms	Never to Current Use		1.13 (1.04-1.23)
	Current to Non-Current Use		0.95 (0.90-1.00)
	Non-Current Use to Current		1.10 (1.03-1.17)
Peer cigarette use	Never to Current Use		1.42 (1.29-1.57)
	Current to Non-Current Use		0.68 (0.64-0.72)
	Non-Current Use to Current		1.24 (1.15-1.34)

^aTwo separate unadjusted models were conducted, one for current ENDS use, and one for ever ENDS use.