Table 1.

Experiment Schedule for Training, Testing, and Vapor Exposure

Group	Training phase I DD 1–24	10 days vapor exposure	Training phase II DD 25–34	Stability/long-term test DD 35–39	Vapor challenge/ short-term test DD 41	Vapor challenge/ short-term test DD 42	24 h Post exposure DD 43
Age (PD)	35–60	70–80	81–89	90–94	100	101	102
1	No exposure	0 mg/mL Nicotine	No exposure	No exposure	0 mg/mL Nicotine	24 mg/mL Nicotine	No exposure
2	No exposure	12 mg/mL Nicotine	No exposure	No exposure	0 mg/mL Nicotine	24 mg/mL Nicotine	No exposure
3	No exposure	24 mg/mL Nicotine	No exposure	No exposure	0 mg/mL Nicotine	24 mg/mL Nicotine	No exposure

DD = delay discounting day, PD = postnatal day.