Table 1.

Summary of experiments and results

Figures and Experimental Description	Summary of Results
Figure 1 Measurement of phasic DA combined with intraoral infusion (Section 2.4).	I.o. infusion of 10% sucrose or 0.32% saccharin, but not 0.005% menthol nor water, increases phasic DA release in the NAc core.
Figures 2–4 Combined i.o. and i.v. self-administration training and behavior using long training regimen (Section 2.5).	Combined i.o. infusion of sucrose or saccharin with i.v. nicotine elevates self-administration compared to i.o. water or menthol combined with i.v. nicotine. Combined i.o. sucrose plus i.v. nicotine leads to decreased self-administration compared to i.v. nicotine alone.
Figure 5 Progressive ratio test (Section 2.6) one day after long-training regimen. Rats used were the same as in Figures 2–4.	No differences in sucrose, menthol, nor saccharin in breakpoint.
Figure 6 Conditioned reinforcement test (Section 2.7) after receiving short training regimen (Section 2.5)	Conditioned reinforcement for saccharin nor menthol were altered by nicotine pairings compared to saline pairings.
Figure 7 Two-bottle choice (Section 2.8)	Menthol or saccharin increase oral consumption of nicotine.