Mention the source and harmful effects of cannabinoids.

Explanation

### Step-by-Step Solution:

1. **Definition of Cannabinoids**: Cannabinoids are a group of chemicals that interact with cannabinoid receptors in the brain.

**Hint**: Remember that cannabinoids are not just one chemical but a group that affects brain receptors.

2. **Source of Cannabinoids**: The primary source of natural cannabinoids is the inflorescence of the plant Cannabis sativa.

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