<s>[INST] Hi, I quit smoking marihuana after using it for about a year. I had a cough and every now and then I hack up black spotted phlegm. Thats not what Im worried about though. Within the spotted phlegm I get little streaks of blood. Should I worry about the blood? Because Im not going to lie, the blood streaks do worry me a little. [/INST] Hello dear, thanks for your question on Chat Doctor. I can understand your problem and situation. Blood in phlegm is known as hemoptysis. And it is seen commonly in smokers. Following diseases need to be rule out in smokers with hemoptysis .1. Chronic bronchitis.2. Infections like tuberculosis and pneumonia3. Lung cancer. So better to consult pulmonologist and get done1. Chest x ray2. CT thorax3. PUT (pulmonary function test)Chest x-ray and CT thorax are needed to rule out infections and cancer.PFT is needed to rule out bronchitis. So better to consult pulmonologist and first diagnose yourself and then start appropriate treatment. </s>