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INTRODUCTION Limited data exist on factors associated with concurrent use patterns of electronic nicotine delivery systems (ENDS) and cigarettes. We examined longitudinally perceptions and experiences with ENDS in relationship to concurrent use patterns among established, recent smokers who recently initiated ENDS. METHODS Participant recruitment took place using paid digital advertisements on social media. Between December 2020 and October 2021, 303 adults aged ≥21 years from across the US who currently or recently smoked and had initiated ENDS use within the past 30 days or reinitiated ENDS use after more than one year of non-use were surveyed. Multinomial logistic regressions were conducted to analyze association between the outcome of current use pattern at follow-up at 1 month [rejectors (discontinued ENDS, continued smoking), primary smokers (concurrent users, mostly smoke), dual user (similar smoking and ENDS use), primary vapers (concurrent users, mostly vape), and switchers (discontinued smoking, continued using ENDS) or quitters (discontinued both smoking and ENDS] and perceptions of and experiences with ENDS predictors at baseline. RESULTS At follow-up at 1 to 2 months after initiating ENDS, 20% were rejectors, 31% were primary smokers, 13% were dual users, 19% were primary vapers, and 17% were switchers/quitters. Perceiving ENDS as less harmful than smoking or being uncertain and as equally or more enjoyable smoking, experiencing a lot or complete reduction in cravings to smoking and in irritability with ENDS use, liking the taste of ENDS, and being satisfied with vaping were associated with higher odds of quitting smoking compared to rejecting ENDS or mostly smoking at follow-up at 1 month. CONCLUSIONS Findings highlight the importance of initial ENDS perceptions and experiences when examining tobacco outcomes and potentially for developing policies and interventions targeting smoking cessation. ENDS initiators are differentiating into distinct use patterns based on these factors within a short period of time. [ABSTRACT FROM AUTHOR]