Name a cancer-causing chemical found in tobacco.

Explanation

### Step-by-Step Solution:

1. **Understanding Tobacco and Cancer**: Tobacco contains numerous harmful chemicals, many of which are known to cause cancer. It is important to recognize the relationship between tobacco use and cancer development.

2. **Identifying Cancer Types Associated with Tobacco**: Tobacco is primarily linked to several types of cancer, with lung cancer being the most prominent. Other cancers associated with tobacco use include mouth cancer and lip cancer.

3. **Recognizing Cancer-Causing Chemicals**: There are approximately 70 cancer-causing chemicals found in tobacco. These chemicals contribute to the mutation of cells in the body, leading to rapid cell division and the formation of tumors.

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