Henderson et al. (1990) found that non-responders in the Survey of Health were less educated at military enlistment than responders, so the educational attainment in this sample may not be representative of all veterans. Finally, the present sample of male Vietnam-era veterans was predominantly Caucasian, thus results may not generalize to other ethnicities, to women, to non-veterans, or to cohorts who grew up in an era with different levels of acceptance of and/or access to cannabis.
