What is it that you must use in order to smoke? Your hands, of course! When a craving hits, work on teaching yourself: how to flip a pen through your fingers (https://youtu.be/dDayvRnEPrI); or learn a coin or card trick; how about practicing your Vulcan “Live long and prosper” sign on your non-dominant hand?! Put your mind on mastering something with your hands and that craving will be gone well before your new skill is mastered!