Q: What is the major cause of chronic respiratory disease as well as cardiovascular disease and cancer?


Read this paragraph and choose the correct option from the provided answers:

Smoking is the major cause of chronic respiratory disease as well as cardiovascular disease and cancer. Exposure to tobacco smoke by smoking or by breathing air that contains tobacco smoke is the leading cause of preventable death in the United States. Regular smokers die about 10 years earlier than nonsmokers do. The Centers for Disease Control and Prevention (CDC) describes tobacco use as "the single most important preventable risk to human health in developed countries and an important cause of [early] death worldwide. " Simply stated: Stopping smoking can prevent many respiratory diseases.

 Choices:

- drinking

- exercise

- diet

- smoking


A:
smoking