Question

1. what is a known health problem caused by smokeless tobacco?

cataracts in the eyes
emphysema
lung cancer
mouth cancer

Explanation:

Smokeless tobacco is often placed in the mouth (e.g., as snuff or chewing tobacco). It has direct contact with the oral tissues. Cataracts are mainly related to eye - specific issues (like aging, UV exposure etc., not directly smokeless tobacco). Emphysema and lung cancer are more commonly associated with smoking (inhalation of tobacco smoke into the lungs). Mouth cancer is a known health problem as the harmful chemicals in smokeless tobacco can damage the cells in the mouth over time.

Answer:

mouth cancer