Comprehension Passage

Instruction for passage: Read the passage carefully and choose the correct answer from the given alternatives.

Smoking is the single largest preventable cause of death worldwide. It is killing about 2200 people in India every day which means one every forty seconds. It is alarming that in spite of this smoking is increasing among the youth of India. According to a World Bank study India, Indonesia and China are the only countries in the world where the incidence of smoking is going up. It is increasing not only in cities but also in towns and villages. Higher education groups are also taking to smoking more readily. Since smoking enjoys social acceptance. It is easy to get cigarettes. What starts as an experiment, soon turns into a habit. It is difficult to give up smoking because, unlike other drugs, the craving for it is immediate. Nicotine in cigarettes brings structural changes to the brain. Its non-availability can cause symptoms of agitation. Smoking also has a strong associational aspect. People smoke while reading, after meals, or with a cup of coffee.

Nicotine brings about what kind of changes in the brain ?

1
Chemical changes
2
Atmospheric changes
3
Physical changes
4
Structural changes

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