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Hello and welcome to JA. Dr Saleem here. Will be answering you shortly
Do you have any other symptoms like fever, night sweats or weight loss?
For how long have you been having cough and blood stained sputum ?
A clear chest x ray is a good sign. Bronchitis is the commonest cause of blood in cough so if there are no alarm symptoms as i mentioned above, you are likely to be having this because of bronchitis which is very common with smokers.
You can take capsule transamine to help with this.