All you dumbass motherfuckers saying that smoking weed doesnt cause you to expel tar (which is blackish/brown) are fucking momos or have some serious lung issues. If you smoke weed and weed only for a long time, you will eventually start to expel tar/resin from you lungs. If you dont, then you are the ones that need to get some medical help to clear your lungs. Good day BRIANLESS MORANSSSSS!!!URRRRRRR HURRR DURRRRRR!!!!!!