Click on image to view larger version.

Figure 2 Mean (± SEM) urinary levels of epinephrine, norepinephrine, and dopamine on carbon monoxide inhalations (CO), cigarette smoking (CS) and air inhalations (AIR), n = 10. *p < 0.05. Urine was collected for 24 h. The levels while smoking cigarettes were significantly (p < 0.05) higher compared to other treatments.