Cigarette smoke is a strong irritant, a major contributing factor to chronic sinusitis. It can also predispose to acute and chronic infection. An acute flare-up of long-standing chronic sinusitis is not infrequently, transiently accompanied by blood in the mucous.
Should the spottage of blood persist as your acute symptoms subside in 7-14 days, you should seek medical attention for it as it could be a sign of disease other than sinusitis.
Good luck
Also, stop smoking or you will die for sure, hard fact of life. Smoking will cause cancer, it will destroy your health, and it is likely the cause of the majority of your sinus problems. Stop now while you still can! (it also paralyzes the tiny hairs and fingerlike projections in your chest that help to cleanse and clean out your bronchia/lungs)
It is sometimes normal to see small blood vessels present in mucus from your nose if you have been blowing your nose a lot and sneezing, etc. You should not be seeing this in your chest mucus though, although it is not unheard of and could also be harmless. If you see anything other than very tiny blood vessels and little bright red traces of blood then you should definitely seek medical assistance and evaluation. Basically when you blow your nose too much the tiny delicate vessels lining your sinus cavities and nasal cavity can become damaged and dislodge and then you see this in your tissue. Frequent blood or more than just a trace here and there is NOT normal though and could signify a persistent infection or other underlying issue you should have treated.