You said yourself it's the not the nicotine, it's the act of smoking you want to indulge in. You need to replace that urge to roll a fag and smoke it, with something else. Anything really, messing with a yo-yo, chewing gum, whatever. Something that you can get into a routine with on the occasions you normally decide to roll, and do something else instead. Before you know it you'll be reaching for this new 'thing' instead and you'll be sorted. Just make sure your new little habit doesn't involve smoke, ok?