If you have an option of subbing I would go with the quick fix. It has had a 100% success rate as long as if you have the temperature right. I smoked for 15 years 2-5 times daily and it took me 35 days to test clean on the home tests. I'm 6 foot 2 230 pounds though. Test yourself at home and see where you stand. You might be able to pass now but you need to hometest yourself first. Goodluck.