Conducted by the National Institute on Drug Abuse (NIDA), a branch of the National Institute of Health (NIH), this "ongoing study of the behaviors, attitudes, and values of American secondary school students, college students, and young adults" is primarily based on data from surveys of some 50,000 eighth, tenth, and twelfth graders conducted since 1991. The site provides press releases as well as summary data charts and tables of recent reports, a substantial bibliography of papers and monographs generated by the study, information about study design, materials for school administrators, and more. Recent study data currently available on-site include statistics on teen drug use, smoking, and cigarette brand preferences. Microdata from the cross-sectional, in-school surveys may be obtained through a link to the Substance Abuse and Mental Health Data Archive (SAMHDA).