In that case you should have a good exam of your nose and throat
by an ENT specialist, a chest X-ray and 3 sputum cytologies, looking for cancer
cells in your sputum.
If you are only 25, with the same smoking history, you might want to wait until it happens again; that is blood again in your mucous. Anywhere in between these two scenarios, you could go either way but the closer to age 35, the safer for you to have this looked-into now.