Table 1.

Characteristics of the sample.

	Nicotine Dependent Smokers			Controls
	EA	AA	Total	EA	AA	Total
	n=828	n=466	n=1,294	n=1,538	n=533	n=2,071
no comorbid diagnosis	9%	6%	8%	73%	21%	71%
alcohol dependence	91%	94%	41%	27%	35%	30%
cocaine dependence	43%	66%	51%	8%	20%	11%
cigarettes per day
0–10	4%	24%	11%	88%	90%	89%
11–20	39%	53%	44%	11%	9%	10%
21–30	25%	9%	19%	1%	0%	1%
≥31	32%	14%	25%	0%	0%	0%
Age
mean age	40	40	40	38	40	39
< 35	29%	18%	25%	35%	20%	31%
35–39	23%	27%	24%	23%	25%	24%
40–44	23%	32%	26%	25%	32%	27%
≥45	25%	23%	24%	16%	23%	18%
male	60%	55%	58%	36%	47%	39%
female	40%	45%	42%	63%	53%	61%
Income < $20,000	15%	37%	21%	3%	18%	5%
No High School Degree	14%	33%	23%	3%	13%	7%