What are the harmful effects of smoking cigarettes?

Explanation

### Step-by-Step Text Solution:

1. **Introduction to Cigarette Ingredients**:
Cigarettes contain approximately 600 ingredients. When burned, they produce around 7000 chemicals.

2. **Cancer-Causing Chemicals**:
Out of these 7000 chemicals, at least 69 are known to cause cancer. Some of the notable harmful chemicals include:
- Nicotine
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