From the Centers for Disease Control and Prevention. Use of smokeless tobacco among adults--United States, 1991.
D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010947:Plants, Toxic; D011159:Population Surveillance; D014029:Tobacco Use Disorder / Q000453:epidemiology; D014030:Tobacco, Smokeless; D014481:United States / Q000453:epidemiology