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Effect of increasing e-cigarette output wattage during training on number of 4s nose-only puffs of 50% propylene glycol/50% vegetable glycerol vehicle aerosol received when reinforced by 3s of access to a 0.01 ml liquid dipper containing sweetened milk. Mean (+/− SEM) aerosol vehicle vapor puffs per 30-min test session received by male rats are shown in open squares (◻) and females are shown in filled circles (●).
