its easy to quit smoking , you must have the urge to do it , and you must dedicate yourself to quit , instead of smoking , just chew a candy , or make yourself busy with something like exercise , yoga , playing basketball, most important thing you must have self discipline to yourself , and a self control .
Its not easy especially to those people who is very addicted in smoking, but if you are determined to quit you can do that, not immediately because it's too hard if you're used to it everyday, but you can do it slowly, step by step.