How to make smooth jump?

I have this mechanic where when you click the mouse anywhere on the screen, the character jumps in that direction. But the transition isn't smooth. How can i make it smooth?

Here is the code:

 var jumpDelay : boolean;
 var doubleJump : int = 0;
 private var ray : Ray;
 private var rayCastHit : RaycastHit;
 
 
 
     function Update()
        {
             if( Input.GetMouseButton(0) && jumpDelay == false)
        {
          Jump();                    
     }
 }
  
     function Jump()
        {
             if (doubleJump <= 1)
        {
             rigidbody.velocity.y = 8;
             
             ray = Camera.main.ScreenPointToRay (Input.mousePosition);
     if (Physics.Raycast (ray, rayCastHit))
 {
      transform.position.x = rayCastHit.point.x;
      transform.position.x = Mathf.Clamp (transform.position.x, -4, 4);}
                 jumpTimer();
     }
 }
  
     function jumpTimer()
        {
          if (Input.GetMouseButton(0))
        {
               doubleJump ++;
          }
  
               if (doubleJump > 1)
                {
                    doubleJump = 0;
                       jumpDelay = true;
                       yield WaitForSeconds(1);
                         jumpDelay = false;
            }
        }