Figure 2.

Long-term effects of nicotine vapor exposure on average choice preference across 6 days of stable responding. Rats showed no significant long-term effects on impulsive choice 15 days after a 10-day exposure to 0 mg/mL nicotine vapor (0 mg/mL Nic, blue squares), 12 mg/mL nicotine vapor (12 mg/mL Nic, green squares), or 24 mg/mL nicotine vapor (24 mg/mL Nic, red squares). Impulsive choice was averaged across 6 days of stable responding in the delay discounting task (delay discounting days 35–40) and data are presented as mean ± SEM.