Assessment of body temperature. 5 failed to block nicotine- induced hypothermia and did not induce per se hypothermia. Baseline rectal temperature was measured just prior to injection of 5 (1.0 mg/ kg, sc) or vehicle (0.9% saline). Ten minutes later, nicotine (0.5 mg/ kg, sc) or vehicle (0.9% saline) was injected, and temperature was measured again after 15, 30, 60, and 120 min. Values represent the mean (±SEM) body temperature (°C): (###) p < 0.001 difference from T =0 for the nicotine group; (***) p < 0.001 difference from 5/ VEH and VEH/VEH at T =15 and T = 30. For detailed statistics, see “Results”.