Question

1. which statement about smoking and cancer is true?

smoking is not a factor in cancer of the esophagus, stomach, or pancreas.
smoking is not a factor in oral (mouth) cancer.
smoking is related to 30% of all cancer deaths in the united states.
smoking is responsible for all lung cancer deaths in the united states.

Explanation:

• Smoking is a risk factor for esophageal, stomach, pancreatic, and oral cancers. So the first two options are incorrect.
• While smoking is a major cause of lung cancer deaths, it is not responsible for all (there are cases like non - smoker lung cancers due to genetic or environmental factors like radon). So the fourth option is incorrect.
• It is a known fact that smoking is related to about 30% of all cancer deaths in the US.

Answer:

Smoking is related to 30% of all cancer deaths in the United States.