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Operant Conditioning and Reinforcement Operant conditioning maintains smoking behavior through two primary reinforcement mechanisms: Positive Reinforcement : Nicotine produces pleasurable effects including relaxation, alertness, mood improvement, and social connection

Results LCs cause significantly greater adverse effects on airway epithelial function than cigarettes To assess the impact of LCs on human airway epithelia, we chronically exposed HBECs and (i) fixed cells to perform gross analysis by light microscopy and (ii) imaged live cells by XZ confocal microscopy

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