im 40 years and quit smoking 10 years ago ,over the last year ive smoked the odd packet here and there,i have recently had blood in my saliva,i have no cough,a slight chest pain,and an odd feeling in my left hand side could this a blood clot in the lung.
Thanks for your question on Chat Doctor. I can understand your concern. You are having hemoptysis (blood in sputum). You are also an active smoker. So following are the causes for you hemoptysis. 1.  Pneumonia 2.  Tuberculosis 3. Lung cancer 4. Pulmonary embolism (blood clot in lung). So consult pulmonologist and get done 1. Clinical examination of respiratory system 2. Chest x-ray 3. PUT (pulmonary function test) 4. CT pulmonary angiography. You will need treatment according to the diagnosis. So first diagnose yourself and then start appropriate treatment. Don't worry, with treatment, you will improve. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.