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Thank you for your question.
The standard cutoff for a positive test result for regular users is 5-7 days.
I am presuming you mean you quit smoking when your wife was at 15 weeks and 6 days in her pregnancy and are concerned about her being coming back positive at birth.
So in this case I can safely say that she would not test positive.
Let me know if you have more questions.
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Neither the infant nor the mother will test positive even if extensive tests are done at birth.