black spots in saliva - my friend was very worried one day and went to hospital for black spots in saliva(from lungs), he went to the hospital and had tests done with tubes/ incisions on his left side, they are clueless with results, i am sure that this problem he has was contributed by marijuana and cigarette smoke, i am a frequent only marijuana smoker and i do also find black spots in my fleghm.. i ve always been passive with these sideeffects, since i simply thought that my lungs are cleansing themselves by releasing this resin ...do you concur?