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The length of time that nicotine stays in the body and cotinine can be a reliable indicator of nicotine use depends on the amount of tobacco smoked, the number of years smoking tobacco, and the type of nicotine test performed. It can be as short as 2 days, or as long as 3 months.
The black stuff is tar. It takes several months to get the tar out your lungs. And when you smoke, you stay sick much longer. I used to be a ciggarette smoker. I would stay sick for weeks and coughed up black stuff for about 3 or 4 months, even when I wasn't sick.