Table 2. Addiction and Quitting Beliefs (n=306)^a.

	Intentions			Feelings of Risk			Worry			Self-Efficacy
Variables Entered	β	p	R2 (F-Change, Sig. F- Change)	β	p	R2 (F-Change, Sig. F- Change)	β	p	R2 (F-Change, Sig. F- Change)	β	p	R2 (F-Change, Sig. F- Change)
Step 1 Demographic and Smoking Characteristicsb			0.05 (F = 2.47, p=0.024)			0.09 (F = 4.65, p=0.000)			0.22 (F = 14.31, p=0.000)			0.09 (F = 4.78, p=0.000)
School	-0.06	0.36		-0.02	0.69		0.06	0.26		-0.02	0.78
Experimental condition
A vs C	0.04	0.53		-0.10	0.11		0.00	0.96		0.03	0.62
B vs C	0.06	0.41		0.01	0.90		0.03	0.57		0.00	0.94
Gender	0.09	0.12		0.22	0.00		0.22	0.00		0.03	0.65
Race	-0.03	0.62		-0.03	0.60		-0.18	0.001		0.03	0.61
Number of cigarettes	-0.15	0.01		0.17	0.003		0.40	0.00		-0.29	0.000
Step 2 Addiction Beliefs			0.08 (F = 1.31, p=0.24)			0.15 (F = 2.91, p=0.004)			0.24 (F = 0.56, p=0.81)			0.20 (F=4.89, p=0.000)
Covariates were included in each step of the analysis but are not shown here for clarity of presentation.
Amount to addiction	0.06	0.35		0.08	0.15		0.07	0.22		0.06	0.28
Can avoid addiction	-0.06	0.33		0.01	0.86		0.00	0.98		-0.07	0.28
Judgment	0.05	0.44		-0.05	0.43		0.01	0.90		0.04	0.44
Determinism1 (never addicted)	-0.05	0.46		-0.13	0.03		0.04	0.44		0.11	0.07
Determinism2 (unavoidable)	-0.05	0.38		-0.16	0.01		-0.07	0.22		0.06	0.33
Agentic1 (control addiction)	-0.02	0.76		-0.02	0.77		0.02	0.68		0.18	0.00
Agentic2 (quit if really want to)	0.13	0.05		0.05	0.42		-0.04	0.45		0.16	0.01
Agentic3 (willpower)	0.02	0.71		0.02	0.77		0.02	0.75		0.04	0.53
Step 3 Worry			0.09 (F = 3.69, p=0.06)
Amount to addiction	0.05	0.42
Can avoid addiction	-0.06	0.32
Judgment	0.05	0.44
Determinism1 (never addicted)	-0.05	0.41
Determinism2 (unavoidable)	-0.05	0.45
Agentic1 (control addiction)	-0.02	0.72
Agentic2 (quit if really want to)	0.13	0.04
Agentic3 (willpower)	0.02	0.74
Worry	0.12	0.06
Step 4 Feelings of Risk			0.11 (F = 6.15, p=0.014)
Amount to addiction	0.04	0.51
Can avoid addiction	-0.07	0.31
Judgment	0.06	0.36
Determinism1 (never addicted)	-0.03	0.68
Determinism2 (unavoidable)	-0.02	0.69
Agentic1 (control addiction)	-0.02	0.78
Agentic2 (quit if really want to)	0.12	0.06
Agentic3 (willpower)	0.02	0.75
Worry	0.04	0.56
Feelings of risk	0.17	0.01
Step 5 Self-Efficacy			0.12 (F = 2.81, p=0.10)
Amount to addiction	0.03	0.61
Can avoid addiction	-0.06	0.36
Judgment	0.05	0.40
Determinism1 (never addicted)	-0.04	0.56
Determinism2 (unavoidable)	-0.03	0.66
Agentic1 (control addiction)	-0.04	0.56
Agentic2 (quit if really want to)	0.10	0.12
Agentic3 (willpower)	0.02	0.81
Worry	0.06	0.42
Feelings of risk	0.18	0.01
Self-efficacy	0.11	0.10

^aIncludes only the 306 participants who provided complete data.

^bExperimental condition A = There is a genetic link to nicotine addiction; Condition B = There is not a genetic link; Condition C = Attention control. Gender: 1 = Men, 2 = Women. Race: 1 = Non-white, 2 = White. Number of cigarettes: 1 = less than 1 per day; 2 = 1 or more per day.