Using Peer Crowd Affiliation to Address Dual Use of Cigarettes and E-Cigarettes among San Francisco Bay Area Young Adults: A Cross Sectional Study.

Given the emerging tobacco landscape, dual use of cigarettes and e-cigarettes has increased among young adults, but little is known about its associated factors. Peer crowds, defined as macro-level connections between individuals with similar core values (e.g., "Hip Hop" describing a group that prefers hip hop music and values strength, honor, and respect), are a promising way to understand tobacco use patterns. We examined associations between peer crowds and tobacco use patterns by using data from a cross sectional survey of 1340 young adults in the San Francisco Bay Area in 2014. Outcomes were the past 30-day use of: neither cigarettes nor e-cigarettes; cigarettes but not e-cigarettes; e-cigarettes but not cigarettes; and both cigarettes and e-cigarettes. Peer crowds included Hipster, Hip Hop, Country, Partier, Homebody, and Young Professional. Multinomial regression analysis indicated that peer crowds were significantly associated with different tobacco use patterns. Compared to Young Professionals, Hip Hop and Hipster crowds were more likely to dual use; Hipsters were more likely to use e-cigarettes only, and Country participants were more likely to smoke cigarettes only. These findings suggest that tobacco control campaigns and cessation interventions should be tailored to different young adult peer crowds and address poly-tobacco use.