*Goes back on topic*
I'm 15, turning 16 in 2 months, so that makes me almost exactly 1 year older than you. I'm 5'6'' too... and I feel I've been 5'6'' since I was 14. But, people here in this forum and around me said that I still have potential to grow. Well, all you have to do is be patient I guess.
As for smoking, If you really can't stop, then I guess we can't do anything about it. Smoking won't affect growth, as it does not damage the liver. But watch out for your lungs.