I particularly hesitate to give a hypochondriac advice over the internet, as it almost certainly serves to add fuel to the fire. My cautious answer would be that any sort of chest discomfort could represent something serious and if your sympotms are severe you should see your doctor. However, the chances of a 30 year old female, who is otherwise healthy, to have significant heart disease is low. In particular, if you have sinus infections, and are also otherwise concerned with your health, you should stop smoking.