Read the passages given below and answer the questions that follow.

If there is one single factor responsible for the alarming rise in heart attacks among young, seemingly healthy Indians, it is smoking. For patients younger than 40, smoking is the main cause of heart disease. While the number of people, who smoke, has dropped by almost 40 percent in the West over the past decade, it has astonishingly doubled in India over the same period. Smoking a pack of cigarettes a day, makes you seven times more vulnerable to heart disease than a non-smoker. However, by quitting smoking one can cut down the risk factor by a huge margin. A person who gives up smoking can, within a year, reduce the risk factor to that of a non-smoker.

Choose the correct option to answer each question.

How can a person reduce the chances of having a heart attack?