What is common name of tobacco?

Explanation

**Step-by-Step Text Solution:**

1. **Identify the Plant**: The question asks for the common name of tobacco. Tobacco is derived from a specific plant.

2. **Scientific Name**: The scientific name of the tobacco plant is *Nicotiana tabacum*. This is important to note as it helps in understanding the classification of the plant.

3. **Common Name**: The common name for tobacco is simply "tobacco". However, it is often referred to colloquially as "killer weed" due to its harmful effects on health.

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