Please answer the following question: When a person smokes there are chemicals released by the tobacco that enter the lungs. Because the lungs have to work harder to remove the chemicals, the body has to work harder to get the air needed to survive. Having read the above passage, choose the right answer to the following question (choices are increase or decrease ): If Mona is a non-smoker, but decides to start smoking, what happens to the difficulty her lungs experience in removing chemicals from the air increase or decrease?
A:
increase