You should be fine but anytime you have smoked in the last 60 days its a good idea to use a little dillution the morning of the test.
Drink 36 ounces of gatorade the morning of the test
Pee 3 or 4 times before the test
When taking the test
Pee a little in the toilet first
Pee 2 ounces in the collection cup
Pee the rest in the toilet.
In your case I would go with about 24 ounces of a sports drink like gatorade the morning of the test. If there's no warning then just stall a little and tell them you need to drink some fluids before you can pee.
