If you are talking about snakes eventually the new skin will be just like the old one so the snake using a rough surface the snake will repeatedly rub against until the old skin peels of revealing the new one underneath
Enablers encourage negative activity and support others who make mistakes and put other people in harms way.
The nicotin and the tar cause the imobilizarion of the traquea cilious, so if you have a cough your system cant expel the bacteria