Panels A-D: Mean (±SEM) total food intake before and after a 10-minute inter-meal interval, following injections of saline, expressed as the mean intake during these injections, and 4 doses of nicotine (panel A), nornicotine (panel B), anatabine (panel C), and anabasine (panel D). *p < 0.05, **p < 0.01 difference between saline and drug at the indicated dose. #p<0.05, ##p<0.01 difference between the first and second bout of food intake. Note that the dose ranges and intervals differ between panels.