Table 2.

Lifetime Rates of Habitual Smoking in Alcohol-Dependent and Non-Alcohol-Dependent Siblings of COGA Probands

	Alcohol-Dependent Siblings of COGA Proband		Non-Alcohol-Dependent Siblings of COGA Proband
Habitual Smoking	Male (%)	Female (%)	Male (%)	Female (%)
Yes	61.3	60.7	35.7	29.9
No	40.9	37.3	20.3	14.6

COGA = Collaborative Study on the Genetics of Alcoholism.

Probands = alcohol-dependent patients and control subjects initially recruited for the COGA study.

SOURCE: Adapted from Bierut et al. 1998.