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Responding for food pellets (20-min) in rats chronically exposed to tobacco smoke (n=10) and control rats (n=10). Tobacco smoke exposure was discontinued after 32 days and food responding was recorded for 7 days post tobacco smoke exposure (Day 33 – 39). Asterisks (** P<0.01) indicate a decrease in responding on the active lever compared to the control group. Data are expressed as means ± SEM.
