Name an opioid drug and its source plant. How does the drug affect the human body?

Explanation

### Step-by-Step Solution:

1. **Identify an Opioid Drug:**
- The opioid drug we will discuss is **Heroin**. It is also commonly known as **smack**.

2. **Source Plant of Heroin:**
- Heroin is derived from the **poppy plant**, specifically from a species called **Papaver somniferum**, which is commonly referred to as the **opium poppy**.

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