10.34691/UCHILE/TDZQU9Parrado , Felipe ErnestoFelipe ErnestoParrado 0000-0002-5169-8133Universidad de ChileMiguez, GonzaloGonzaloMiguez0000-0001-6975-3789Universidad de ChileSilva, Matías FMatías FSilva0009-0003-9526-7487Universidad de ChileFuentealba, Catalina FernandaCatalina FernandaFuentealba0009-0007-7599-7545Universidad de ChileLaborda, MarioMarioLaborda0000-0003-2459-3042Universidad de ChileQuezada, VanetzaVanetzaQuezada0000-0002-7761-0953Universidad de ChileRepositorio de datos de investigación de la Universidad de Chile2026Social SciencesParrado , Felipe ErnestoFelipe ErnestoParrado Universidad de Chile2025-12-122026-04-133112317application/zip1.0CC-BY 4.0FONDECYT 3240295. The literature suggests that nicotine accelerates the 'internal clock,' increasing preference for immediate rewards and altering sensitivity to discriminative cues associated with delayed consequences. This experiment evaluated whether a behavioral training procedure based on exposure to delays could buffer the impact of vaporized nicotine on decision-making. In this study, 24 rats (both females and males) learned to operate a lever at different intervals to obtain rewards, simulating situations in which it is necessary to choose between a sooner reward or a larger but delayed one over a period of six weeks. Subsequently, half of the groups were passively exposed to 0 mg/L (CN) or 3 mg/L (EX) of nicotine for 15 minutes, followed by training in a chained-choice task with optimal and suboptimal alternatives for two weeks