1. It is a habit formed from childhood.
2. It reduces stress and anxiety.
3. It is a way of dealing with boredom.
4. It is a way of releasing adrenaline.
5. It is a way of dealing with negative emotions.
6. It is a way of keeping the hands busy.
7. It is a way of channeling nervous energy.
8. It is a way to keep the mind focused.
9. It is a way to relieve inner tensions.
10. It is a way to express frustration or anger.