Thanks for your question on Chat Doctor. I can understand your concern. Your friend is having hemoptysis (blood in sputum). In the cold climate, possibility of pneumonia is more. And he is also a smoker. So pneumonia is the likely cause for his hemoptysis. So better to consult doctor and get done chest x-ray to confirm pneumonia. He will need antibiotics and other supportive treatment. Tell him to quit smoking as soon as possible.Don't worry, he will be alright. Hope I have solved your query. I will be happy to help you further. Wishing good health to your friend. Thanks.