I have a tight feeling/sensation in my chest that makes me feel on edge and discomforted, i do smoke now and then, but haven't for a while?

See your doctor: You are young so the list of possibilities is broad, but the risk of something serious is lower. First I suggest you quit smoking, since asthma is one possibility. Others include heart disease, congenital or acquired, panic and anxiety, cardiac rhythm disturbances, malformations of the chest wall, reflux disease, and other things that are best sorted out with a good physical exam and a few tests.