Methods To Quit Smoking

My son had a drug test 1 month ago and has to have another this week. This will be 30 days. Can it stay in your system longer than that even if you haven’t been smoking it for 30 days?

I quit smoking on Sunday night at 10pm. Today is Thursday, 4 am (I work night shift) I have not been having the dreaded nictoine withdrawl symptoms as I feared…then it hit me. Is the nicotine still in my system? And how long does it take before it gets out? I heard it was about 3 days that it took to get completely out?