Table 4.

Specific cell types of Fos-expressing neuronal ensembles in the BSNST that were activated in the nicotine-induced acceleration of the escalation of alcohol self-administration

Group	GAD67
Air-Naive	11.0 ± 1.1
Air-Saline	27.5 ± 18.7
Air-Nicotine	29.8 ± 9.9
Vapor-Naive	8.5 ± 8.2
Vapor-Saline	20.8 ± 6.36
Vapor-Nicotine	17.1 ± 3.2

These data are represented as the mean ± SEM of double-labeled neurons as a percentage of all Fos-labeled neurons. The total percentage does not necessarily add up to 100%, possibly due to incomplete labeling with cell-type markers.