Ok, now this may sound really dumb and simple, but it was my little pink vaporking manual. My very first e cig. That little sucker got me off cigarettes and that makes it golden to me, I don't think it even works anymore, but I still keep it to remember the day I smoked my last cigarette. After two and a half packs a day for thirty five years, a heart attack and many other medical issues, that little pink guy was a miracle for me.