Which of the following has been shown to increase the risk of such diseases as lung cancer, atherosclerosis, and emphysema?

A) Obesity.
B) Smoking.
C) Poor nutrition.
D) Lack of exercise.

Atherosclerosis

A condition where arteries become narrowed and hardened due to a buildup of plaque around the artery wall, which can lead to cardiovascular diseases.

Emphysema

A chronic lung condition characterized by damage to the air sacs (alveoli), leading to breathlessness.

Lung Cancer

A type of cancer that originates in the lungs, often associated with smoking, but can also be caused by genetic factors and environmental pollutants.