Table 2.

Comparison of baseline smoking habits across recruitment strategy.

	Facebook	Google	Research Match	smokefree.gov	Friend/family
Baseline data
	n = 505	n = 200	n = 356	n = 153	n = 273
Cigarettes smoked per day, M (SD)	18.8 (9.5)	16.8 (23.3)	14.7 (9.6)*	20.9 (72.3)	16.2 (11.5)
Nicotine Replacement Therapy
No	346 (68.5%	160 (80%)*	210 (59%)	101 (66%)	158 (57.9%)
Yes	159 (31.5%)	40 (20%)	146 (41%)	52 (34%)	115 (42.1%)
Participated in tobacco counseling
No	466 (92.3%)	168 (84.0%)*	304 (85.4%)*	138 (90.2%)	228 (83.5%)
Yes	39 (7.7%)	32 (16%)	52 (14.6%)	15 (9.8%)	45 (16.5%)
Readiness to quit
Not thinking of quitting	6 (1.2%)*	6 (3%)*	31 (8.7%)*	4 (2.6%)	15 (5.5%)
Thinking of quitting	292 (57.8%)	86 (43%)	238 (66.8%)	75 (49%)	164 (60.1%)
Already quit	43 (8.5%)	16 (8%)	18 (5.1%)	13 (8.5%)	19 (7%)
Set a quit date	116 (23%)	51 (25.5%)	54 (15.2%)	49 (13.2%)	57 (20.9%)
Quit today	42 (8.3%)	41 (20%)	13 (3.7%)	12 (7.8%)	16 (5.9%)
One-week data
	n = 359	n = 100	n = 250	n = 83	n = 193
Have you ever tried an e-cigarette?
No	87 (24.0%)*	27 (27.0%)	46 (18.3%)*	15 (18.1%)	45 (23.1%)
Yes	275 (76.0%)	73 (73.0%)	205 (81.7%)	68 (81.9%)	150 (76.9%)
Used an e-cigarette in the past 30 days
Every day	15 (4.2%)*	8 (8.0%)	14 (5.6%)*	7 (8.4%)	17 (8.7%)
Some days	69 (19.1%)	37 (37.0%)	56 (22.3%)	18 (21.7%)	68 (34.9%)
Not at all	277 (76.7%)	55 (55.0%)	181 (72.1%)	58 (69.9%)	110 (56.4%)
Nicotine Dependence Scale
Within 5 minutes	161 (44.5%)	40 (40.0%)	76 (30.3%)*	38 (45.8%)	71 (36.4%)
6-30 minutes	142 (39.2%)	35 (35.0%)	99 (39.4%)	26 (31.3%)	73 (37.4%)
31-60 minutes	30 (8.3%)	16 (16.0%)	30 (12.0%)	8 (9.6%)	27 (13.8%)
After 60 minutes	29 (8.0%)	9 (9.0%)	46 (18.3%)	11 (13.3%)	24 (12.3%)

^*p-value less than 0.05 (Peer recruitment as comparison group)