inherited traits and environmental influences as a result of having a parent with an alcohol problem history. Also, the use of a combined measure of impulsivity and sensation seeking (the ImpSS scale) may be less informative than separate measures of impulsivity and sensation seeking. Finally, there did appear to be some differences between the members of four alcohol-tobacco use groups on whether a parent or other family member smoked cigarettes. Because we did not capture lifetime parental or familial tobacco use, we could not control for this influence. It is possible that not controlling for familial tobacco use influenced the results, particularly for analyses involving concomitant alcohol and tobacco use. Future investigations can expand on our findings by addressing some of these limitations to further evaluate the relationships of impulsivity, sensation seeking, parental alcohol problems and current alcohol and tobacco use.
