title: Modes of ever marijuana use among adult tobacco users and non-tobacco users-Styles2014.
abstract: BACKGROUND
  Tobacco and marijuana use are related behaviors; therefore, it is important to identify how users consume marijuana, and how it varies with tobacco use status. We estimated the modes of ever marijuana use among current, former, and never adult tobacco users.
  
  
  METHODS
  Weighted data were analyzed for 4181 adults from 2014Styles, an online consumer panel survey of US adults, to estimate proportions for modes of ever marijuana use. Differences in modes of ever marijuana use between categories of tobacco use status were assessed (p-value <0.05).
  
  
  RESULTS
  More than half of current (56.6%) and former tobacco users (50.9%) had ever used marijuana, whereas only 13.0% of never tobacco users had ever used marijuana. Among ever marijuana users, joint use was the most common mode of use among current (86.4%), former (92.5%), and never (79.8%) tobacco users. Similarly, other modes of marijuana use were significantly higher in current and former tobacco users compared to never tobacco users.
  
  
  CONCLUSIONS
  Prevalence of all modes of ever marijuana use was higher in current and former tobacco users. These findings underscore the importance of considering the relationship between marijuana and tobacco use when developing programs and policies aimed at preventing and reducing marijuana use.
authors.affiliation: Office on Smoking and Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA; Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, GA, USA.
authors.forename: Tushar
authors.initials: T
authors.lastname: Singh
authors.affiliation: RTI International, Division of Biostatistics and Epidemiology, Atlanta, GA, USA.
authors.forename: Sara M
authors.initials: SM
authors.lastname: Kennedy
authors.affiliation: Office on Smoking and Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA.
authors.forename: Saida S
authors.initials: SS
authors.lastname: Sharapova
authors.affiliation: Carter Consulting, Inc. contractor to the Office on Smoking and Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
authors.forename: Gillian L
authors.initials: GL
authors.lastname: Schauer
authors.affiliation: Office on Smoking and Health, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA, USA.
authors.forename: Italia V
authors.initials: IV
authors.lastname: Rolle
keywords: Marijuana; mode of use; tobacco