GRE Sample Test 3 Verbal Reasoning 1

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Question 18 is based on the passage below. Select one answer choice.
Studies show that an individual suffering from insomnia is more likely to be a smoker than is a non-insomniac. Clearly, lack of sleep induces insomniacs to smoke.

Question : 18 of 20

Marks: +1, -0

Which of the following, if true, most weakens the argument?

Nicotine is known to have relaxing properties.
Little is known about the causes of insomnia.
Most insomniacs report developing a smoking addiction after having developed sleep problems.
Many of smoking’s physical effects, such as irritability and anxiety, are associated with insomnia
Many insomniacs whose sleep patterns return to normal report quitting smoking.

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