SUMMARY/ABSTRACT The overall goal of R01DA054751 (‘Recreational Marijuana Marketing and Young Adult Consumer Behavior’; R01DA054751, MPIs: Berg, Cavazos-Rehg) is to inform regulatory efforts to minimize cannabis use among disproportionately-impacted populations. This R01 examines the non-medical cannabis market, cannabis use, and related perceptions in consumer segments of diverse young adults. The literature indicates that licit drug retail marketing targets certain populations (e.g., racial/ethnic minorities, SGM, young adults) as well as the consequences of such marketing on substance use in these groups. Our research to date indicates several issues with policy compliance (e.g., age verification), promotional strategies appealing to young people and minorities, various health claims, and minimal health warnings. Our team has also shown the utility of identifying young adults at high-risk for substance use and marketing exposure by using industry market segmentation strategies. R01DA054751 addresses the following specific aims: 1) determine whether neighborhood demography is associated with marketing and point-of-sale practices among non-medical cannabis retailers over time, accounting for policy context; and 2) compare young adult market segments defined by age and minority status vs. psychographics in relation to cannabis use, perceptions, access, and advertising exposure in states with differing cannabis policy contexts (non-medical, medicinal, neither) over time. As part of this work, our team is developing a multi-year cannabis-related policy database, with unique data on retail-related policies. This Administrative Supplement expands upon data collection in each aim of this R01 in order to address key gaps in the literature regarding derived psychoactive cannabis product (DPCPs), and responds to NIDA research priorities and NOT-DA-22-003: Public Health Research on Cannabis. DPCPs have been understudies due to their recent emergence in the US market (since the 2018 Farm Bill). For example, there is no comprehensive, verified, and publicly-available database regarding state DPCP laws, and limited research has examined DPCP retail/marketing or use, particularly from the perspective of legislative context. Notably, the first national estimates of DPCP use were captured in 2023 (past-year Delta-8 THC use: 11.9% of US adults and 11.4% of 12th-graders), indicating the need for and timeliness of research in this area. This is especially important as the under-regulated DPCP market diversifies and expands, and as states and the 2024 Farm Bill navigate ways to address DPCPs. In addressing the specific aims of this Administrative Supplement, we will add: 1) comprehensive data on DPCP laws to our state cannabis law database; 2) DPCP retail audits to our planned cannabis retail audits to characterize the DPCP retail context; and 3) an additional wave of survey data collection for a subset of young adults in our longitudinal cohort study to assess dif...