RT Journal Article SR Electronic T1 Longitudinal pathways of exclusive and polytobacco hookah use among youth, young adults and adults in the USA: findings from the PATH Study Waves 1–3 (2013–2016) JF Tobacco Control JO Tob Control FD BMJ Publishing Group Ltd SP s155 OP s162 DO 10.1136/tobaccocontrol-2020-055625 VO 29 IS Suppl 3 A1 Eva Sharma A1 Maansi Bansal-Travers A1 Kathryn C Edwards A1 Michael J Halenar A1 Kristie A Taylor A1 Karin A Kasza A1 Hannah Day A1 Hoda T Hammad A1 Gabriella Anic A1 Jean Limpert A1 Lisa D Gardner A1 Nicolette Borek A1 Heather L Kimmel A1 Wilson M Compton A1 Andrew Hyland A1 Cassandra A Stanton YR 2020 UL http://tobaccocontrol.bmj.com/content/29/Suppl_3/s155.abstract AB Objective The goal of this study is to examine cross-sectional rates of use and longitudinal pathways of hookah use among US youth (ages 12-17), young adults (ages 18-24), and adults 25+ (ages 25 and older).Design Data were drawn from the first three waves (2013–2016) of the Population Assessment of Tobacco and Health Study, a nationally representative, longitudinal cohort study of US adults and youth. Respondents with data at all three waves (youth, n=11 046; young adults, n=6478; adults 25+, n=17 188) were included in longitudinal analyses.Results Young adults had higher ever, past 12-month (P12M) and past 30-day cross-sectional prevalence of hookah use at each wave than youth or adults 25+. The majority of Wave 1 (W1) hookah users were P12M users of other tobacco products (youth: 73.9%, young adults: 80.5%, adults 25+: 83.2%). Most youth and adult W1 P12M hookah users discontinued use in Wave 2 or Wave 3 (youth: 58.0%, young adults: 47.5%, adults 25+: 63.4%). Most W1 P12M hookah polytobacco users used cigarettes (youth: 49.4%, young adults: 59.4%, adults 25+: 63.2%) and had lower rates of quitting all tobacco than exclusive hookah users or hookah polytobacco users who did not use cigarettes.Conclusions Hookah use is more common among young adults than among youth or adults 25+. Discontinuing hookah use is the most common pathway among exclusive or polytobacco hookah users. Understanding longitudinal transitions in hookah use is important in understanding behavioural outcomes at the population level.