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Objectives: In this study, we prospectively assessed changes in smoking a year after US adults' first-time purchase of a JUUL Starter Kit (JSK). Methods: Descriptive analyses assessed transitions in smoking status at 12 months among adult (age =21) JSK purchasers providing baseline and 12-month follow-up data (N = 27,164 [49.0% of baseline]), stratified by baseline smoking status. Baseline regular use of other ENDS was also considered. Results: Purchasers included baseline past 30-day smokers (65.2%), former smokers (12.0%), and never smokers (9.7%); over 90% were ever-smokers. One year later, the majority (58%) of those smoking at baseline reported no longer smoking. Former smokers or never smokers who were smoking at 12 months represented less than 2% of respondents. Former and current smokers who were regularly using other ENDS at baseline were less likely to report smoking at 12 months. Conclusions: Past 30-day smoking prevalence in a large longitudinal study of first-time JSK purchasers fell by more than half over 12 months. Analyzing the sample composition at purchase and transitions within subgroups defined by smoking status allows for a detailed understanding to help inform assessments of the population health impact of ENDS. ACKNOWLEDGMENT & CONFLICT OF INTEREST STATEMENT: Funding for this study was provided by Juul Labs Inc. Through Pinney Associates, Saul Shiffman provides consulting services on tobacco harm reduction on an exclusive basis to Juul Labs Inc. In that role, he acted as internal editor and coordinator for the papers in this special issue. Erik Augustson is a full-time employee of Juul Labs Inc. As Senior Director of Behavioral Affairs at JLI, he oversaw the conduct of the behavioral research reported in this special issue. [ABSTRACT FROM AUTHOR]