Saliva Test Passing. Help?

My place of employment does "saliva tests". They put a dry stick with 'cotton' on the end and have you hold it in your mouth for 5-10 minutes, making sure it gets wet. They do not allow you to eat or drink 10 minutes before the test, which is completely random. (usually once a month with a group of people) It shows the results right there at the table, no way of cheating this one. :mad:


Im about 5'6 and like 240 lbs (dont know if that effects it or not).


If I were to smoke, how long would it be detectable for?