personally, I would go for the sub. I was a 15+ years smoker, and 15 days clean going with dilution was barely passing home tests.

I had my test today, and used QuickFix 4.0 for my pre-employment UA.

I dont know the results, but I weighed my options and decieded to go with the sub. I feel I made the right choice, and it wasnt as hard as I thought/

When in doubt, sub it out!