... Well the brown phlem could be blood, just older than newer. When its fresh and bright red they call it "frank" blood. So it just means that before you cough it up the blood has had tie to age and turn brown. Or the phlem could be a collection of pollutants from the MJ smoke. ... (9 replies)

... and once or twice what seems to be a very slightly red tinged sputum, never more than these tiny indications, so it does seem that tiny amounts of blood are sometime being produced. ... (0 replies)

... Do you do alot of coughing or forcing the mucus up? ... (1 replies)