<s>[INST] my ex husband has been to hospital to have a scan because he has noticed blood in his mucus.  Very unlikely that he would have told them that he is an alcoholic.  Hospital have told him there is no problem after he had CT scan but if he hasnt told them about his drinking I suspect that they did not consider this.  Is it likely that the blood could be because he is a heavy drinker? [/INST] Thanks for your question on Chat Doctor. I can understand your concern. Your husband is having hemoptysis (blood in sputum). Yes, smoking can cause hemoptysis. Alcohol habit can worsen smoking induced lung damage. Alcohol decreases lung immunity and makes it prone for infection and inflammation. So smoking and alcohol both can cause hemoptysis. Hope I have solved your query. I will be happy to help you further. Wishing good health to your husband. Thanks. </s>