Why does my program break when I add a 'QUIT' option to exit application?

import os
shopping_list = []

def clear_screen():
    os.system("cls" if os.name =="nt" else "clear")

def num_items(shopping_list):
    print ("List has {} items.".format(len(shopping_list)))

def add_to_list(item):
    item = item.upper()
    shopping_list.append(item)
    print ("Added!")

    show_list(shopping_list)

def remove_item(item):
    item = item.upper()
    shopping_list.remove(item)

def show_help():
    clear_screen()
    print("What should we get at the store?")
    print("""
Enter 'DONE' to stop adding items.
Enter 'HELP' to show this menu.
Enter 'SHOW' to show list.
Enter 'REMOVE' to remove items
""") 

def show_list(shopping_list):
    print ("List has {} items.".format(len(shopping_list)))
    for item in shopping_list:
        print("* " + item)

#THIS IS THE LOGIC 
show_help()
while True:
    new_item = input("> ")
    if new_item.upper() == 'DONE' or 'QUIT':
        show_list(shopping_list)
        break
    elif new_item.upper() == 'HELP':
        show_help()
        continue
    elif new_item.upper() == 'SHOW':
        show_list(shopping_list)
        continue
    elif new_item.upper() == 'REMOVE':
        item = input("Which item would you like to remove?  ")
        remove_item(item)
        show_list(shopping_list)
    else:
        add_to_list(new_item)       

    ```