I have been using these test strips for about a year now. I smoke every once in a while and I know how many days it takes until you are clean again. Highly recommended.
These tests are EXACTLY what I needed. I had to take a drug test for my Doctor's Office, to continue to get my scripts for migraine meds. After I stopped smoking for a couple of weeks and doing a vitamin flush, I tested positive. Three days later, I tested negative. I'm a happy camper!