My smoking habit, should I be worried?

Every summer scene I was 14 ( I am 18 know) I would smoke a pack or two ( we get them from a liquor store owner that is fixed, and makes us pay double), never more then three every 5 days, I do it with my friends, normally when are parents are at work, and we all grill food and blow up stuff. I only smoke in June July and august, that is all.. When September hit my calender I quit, should I be worried for lung cancer? I do find my self graving a cig in September but I fight it (STRONG WILL POWER!) but my friends keep going.. I know that smoking is bad and gives you cancer but what doesn't these days, am I right?