Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE customer_orders ( order_id VARCHAR, order_status VARCHAR )
TABLE: CREATE TABLE order_items ( order_quantity INTEGER, order_id VARCHAR )

### Question ###
What is the total number of products that are in orders with status 'Cancelled'?

### Accurate SQL ###

SELECT SUM(t2.order_quantity) FROM customer_orders AS t1 JOIN order_items AS t2 ON t1.order_id = t2.order_id WHERE t1.order_status = "Cancelled"