Home drug tests, how accurate are they? v.I passed!

Ok so here's the story, I'm starting a new job on Dec 26th and I have to drug test on the 20th. I quit smoking on Dec 2nd.
Anyway bought 2 home drug test kits online, and took one of them about an hour ago. I passed! My only question is this, the home drug test "cassette" had 2 lines on it, one for control, and a faint one under the test section. 2 lines is supposed to indicate a negative test, even a faint line, but I'm still worried about it.

Will I pass my lab test even though I had the faint line on the home test? I'm planning to take the 2nd test the night before the real test.

anyone?

95-98% accurate.