title: Latent classes of young adults based on use of multiple types of tobacco and nicotine products.
abstract: BACKGROUND
  New tobacco and nicotine products such as snus, hookah, and electronic cigarettes have risen in popularity in recent years. Use of these products among young adults is of particular interest given that experimentation with new products is common in young adulthood.
  
  
  METHODS
  We conducted latent class analysis among a population-based sample of young adults to identify separate classes based on use of 6 types of tobacco or nicotine products: snus, hookah, electronic cigarettes, cigarillos, snuff, and cigarettes. We then examined how identified classes differed on demographic characteristics and marijuana and alcohol use.
  
  
  RESULTS
  We identified 5 classes: the largest group (60%) was characterized as reporting no or limited use of any of the products, while the smallest group (7%) was characterized by use of many types of products (poly-users). Of the 3 middle classes, 2 were the same size (10%) and were characterized by primarily using 2 of the products: one class used snus and snuff, and the other used cigarillos and hookah; the third class (13%) was characterized by primarily cigarette smoking. Numerous differences were seen across classes, including the poly-users being less likely to be college students/graduates and more likely to be male and use marijuana and alcohol.
  
  
  CONCLUSIONS
  We found that young adults can be grouped into 5 subgroups based on types of tobacco/nicotine products they do and do not use. A poly-use group that uses all types of tobacco products is concerning, particularly given high levels of marijuana and alcohol use reported in this group.
authors.affiliation: Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN erick232@umn.edu.
authors.forename: Darin J
authors.initials: DJ
authors.lastname: Erickson
authors.affiliation: Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN.
authors.forename: Kathleen M
authors.initials: KM
authors.lastname: Lenk
authors.affiliation: Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN.
authors.forename: Jean L
authors.initials: JL
authors.lastname: Forster
mesh_terms: D000328:Adult; D000428:Alcohol Drinking / Q000453:epidemiology; D003710:Demography; D005260:Female; D006801:Humans; D008297:Male; D008385:Marijuana Smoking / Q000453:epidemiology; D015146:Midwestern United States; D011446:Prospective Studies; D012907:Smoking / Q000453:epidemiology; D013334:Students; D062789:Tobacco Products / Q000145:classification*; D055815:Young Adult