GRE Logical Reading: ETS-GRE逻辑单题ETS - 9H1XP6P9OU6KL16FK$

Smoking is a known cause of certain serious health problems, including emphysema and lung cancer. Now, an additional concern can be added to the list of maladies caused by smoking. A recent study surveyed both smokers and nonsmokers, and found that smokers are significantly more anxious and nervous than nonsmokers.