Health Bar fire damage

hi guys. i have a health bar script and i want to have a flame particle system to lower the bar. any suggestions?

below is the script:

 using UnityEngine;

using System.Collections;

public class PlayerHealth : MonoBehaviour { public int maxHealth = 100; public int curHealth = 100;

 public float healthBarLength;

 // Use this for initialization
 void Start () {
     healthBarLength = Screen.width / 2;
 }
 
 // Update is called once per frame
 void Update () {
     AddjustCurrentHealth(0);
 }
 
 void OnGUI() {
     GUI.Box(new Rect(10 ,10, healthBarLength, 20), curHealth + "/" + maxHealth);
 }
 
 public void AddjustCurrentHealth(int adj) {
     curHealth += adj;
     
     if(curHealth < 0)
         curHealth = 0;
     
     if(curHealth > maxHealth)
         curHealth = maxHealth;
     
     if(maxHealth < 1)
         maxHealth = 1;
     
     healthBarLength = (Screen.width / 2) * (curHealth / (float)maxHealth);
 }

}