Your textbook reports on a behavioral change program to address the high rate of smoking in China. This was an important study for several reasons, including the fact that

The number of people who smoke in China approximates the entire population of the United States.

Explanation:

The textbook report on behavioural changes program to address the high rate of smoking in China. This study was important because it included fact about the number of people who smoke in China to be approximated to the entire population of the United States.

By implication, it means that the smokers in China, may even be more than the whole of the people in the United States of America.

This simply suggests that the behavioural changes on Chinese towards smoking suggests massive recognition or acceptance.