How come I spit so much when I smoke?

Dreck in mouth. Among the long list of terrible things that smoking can do to your body, it creates a cess poll of filth in the mouth. Smokers are faced with the choice of swallowing this toxic stew or spitting it out. The best choice is to quit altogether but i wouldn't worry about having to do this too long , as the smoking is likely to cause you to die prematurely.