Rotating the camera to left or right using the scroll wheel

Unity Engine
1

Hello, I am trying to rotate my camera using the scroll wheel.
What I’m saying is: The player press the mouse wheel and move to the left or to the right, so, the camera will rotate to the selected side.

How can I do this?

PS: The scroll wheel needs to be pressed to be able to spin.

2

Do you have the code to rotate your camera already set up? If so, all you need to do is enclose it in:
if (Input.GetMouseButton(2))
{
//rotation code goes here
}

3

I have the following code to left:

if (Input.GetMouseButton(2)  Input.GetAxis("Mouse X") < 0)
		{
			transform.Rotate(Vector3.up * 1.8f, Space.World);
		}

Do you know how to get a smooth rotation?