I was thinking about making some wearable wristband, may be something that looks like a watch or so. It's main idea is to detect whether you just lit a cigarette or not and if you did it will shock your hands to make you leave it. Also it can have some kind of restriction on wearing it, like it may not allow you to turn it off or take if off for some amount of time, like let's say 10 hrs or something like that. and you may wear it with the most used hand when you smoke so it can prevent you from smoking for a while (at least the time you are wearing it). I think also this will make you think a lot before trying to pick a cigarette 
. I see the problem comes with detection of whether you are smoking now or not. so lets see what Ben can do 
. Good Luck.
Hesham Salah