Well I’m sure it would show up but as long as you are in a “program” to de-program you from the evil cigarettes that is approved by the employer, you may get a pass. Of course if you stay on said program for 3 or 4 years, the might get a little suspicious.
Yes, it would show up, and probably would cause the person to not be hired or to lose his/her job, even if they said it was to kick the habit. Nicotine is nicotine, in the urine. The ban probably covers ANY nicotine usage.