Saliva Test Update

I Ordered 3 saliva test kits off of eBay. Smoked a J last night. Got up this morning, brushed, flossed, and rinsed with Listerine (Which is my normal routine every morning even before they announced random saliva tests at work). Tested myself around noon time today (about 12 hrs after I last smoked). PASSED THE TEST!!!

Some background:
51 years old
Daily smoker for 30 years (although much lighter these days)
I only smoke 1 J a day, at night (rarely smoke during the day)
6â??-3â?� only 150 lbs, with a very fast metabolism

So I guess I am done worrying. Do you think it is because I am so thin with such a fast metabolism that I pass, or is the window on these saliva tests rather short???