Replying to NS, I need your drug informed help

So I'm getting my license next week (a little late, I'm 17) and my mom says that I'm getting a urine and blood test for drugs, cause it lowers insurance rates, and I wasnt that worried, cause Ive been clean for a couple months now, so I dont need to worry about any drugs showing up. But then I ask her why do I need a blood test, I hate needles. She says its for other drugs like hallucinagens and nicotine. This changes things, cause this weekend I smoked some cigars, and inhaled, and I dont know how long nicotine stays in your system.
So here are my questions:
how long does nicotine stay in your system, and
2- do you think Id get away with saying second hand smoke?