<s>[INST] sir i smoke for last 14 years, i just started to reduce. but some times i feel tendency t smoke and smoke little more and this caused me when i sleep i have blood in my mouth. it was started when i had cough i took amoxiline tablet and this problem started. [/INST] Hello dear, thanks for your question on Chat Doctor. I can understand your situation and problem. Blood in mouth is mostly due to blood in sputum.  It is known as hemoptysis. And smoking is the cause for your symptoms. Following are the possible causes for hemoptysis in smokers. 1. Lung infection like tuberculosis and pneumonia. 2. Bronchitis3. Lung cancer. So better to consult pulmonologist and get done1. Clinical examination of respiratory system. 2. Chest x-ray. 3. PUT (pulmonary function test). Chest x-ray is needed to rule out lung infection and cancer. PFT is needed to rule out bronchitis. So better to first diagnose yourself and then start appropriate treatment. Quit smoking as soon as possible. It is not a good habit. </s>