MouseWheel Lerp Smoothing Problem

In below code, smoothing works very well with X and Y axises (w-a-s-d), but somehow i can not smooth the zoom in and out (z axis, mouse wheel) with this code. What am i doing wrong?
Thanks in advance.

public float cameraMultiplierX, cameraMultiplierY, cameraMultiplierZ, cameraSmoothness;
private float camX, camY, camZ;
    
void Start () 
{
    camX = 0;
    camY = 0;
    camZ = 0;
}

void Update()
{
    Vector3 finalMovement = Vector3.zero;

    /* -- Raw inputs -- */
    float rawX = Input.GetAxis ("Horizontal") * cameraMultiplierX;
    float rawY = Input.GetAxis ("Vertical") * cameraMultiplierY;
    float rawZ = Input.GetAxis ("Mouse ScrollWheel") * cameraMultiplierZ;
        
    /* -- Lerps -- */
    camX = Mathf.Lerp (camX, rawX, cameraSmoothness * cameraMultiplierX);
    camY = Mathf.Lerp (camY, rawY, cameraSmoothness * cameraMultiplierY);
    camZ = Mathf.Lerp (camZ, rawZ, cameraSmoothness * cameraMultiplierZ);
        
    /* -- Final application -- */
    finalMovement = new Vector3 (camX, camY, camZ);

    mainCamera.transform.Translate(finalMovement * Time.deltaTime);
}

What is adjusted values? Does it mean cameraSmoothness and cameraMultiplier are 500 and 10?

In that case, it means your ratio of the lerp is 5000 while this value should be between 0 and 1.