What is addiction? Give the source of tobacco. List ill-effects of nicotine.

Explanation

### Step-by-Step Text Solution

1. **Definition of Addiction**:
- Addiction is defined as a state of physical or mental dependency on a substance or behavior. It often involves compulsive engagement in rewarding stimuli, despite adverse consequences. This dependency can manifest in various forms, including addiction to substances like alcohol, tobacco, or drugs.

2. **Source of Tobacco**:
- Tobacco is derived from the tobacco plant, specifically from the leaves of the Nicotiana species. The primary harmful substance found in tobacco is nicotine, which is responsible for its addictive properties.

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