Fact 1: Smoking tobacco decreases stamina.

Fact 2: An added benefit is increased stamina and aerobic capacity.

Given the two facts above, answer the question "Smoking tobacco decreases" with the following options: 
- aerobic capacity
 - growth hormone
 - Abnormal cell growth
 - Greenhouse gasses
 - survival
 - kinetic energy
 - insulin production
 - testosterone


 

 aerobic capacity        