Some suggestions, other than devices:
I think successful quitting via ecigs is based making it easy on yourself. Easy meaning less exherted effort. This comes mainly comes from two things: intent, and managed impressions.
Intent:
Before you even buy this stuff, just verbalize to yourself that your goal is to replace smoking with something you find equally as satisfying and enjoyable, but more healthy and less unpleasant. Put it on record that, "Assuming ecigs work for me, I *DO* plan to quit smoking". This sets the stage, without putting too much on the line, as long as ecigs keep their promise and deliver for you, your goal is to quit cigarettes.
First impressions
When you first use ecigs, it will make an impression on your mind. Remember the expression "you only get once chance at a first impression". You want to start with a very high nicotine liquid. Higher than average. You want to give your body the impression: these things deliver. Imagine two scenarios:
1. You get average or low nicotine (because you are trying to quit right? might as well start low), you get a craving, reach for the ecig and give it a vape, and are unsatisifed. You begin thinking ecigs are cheesy and don't deliver. You lose interest in them and keep smoking.
2. You get high nicotine (24+). You get a craving, reach for the ecig and give it a vape, and whoaa you start buzzing hard. Maybe too hard, but your brain gets the message "these things DELIVER!" Your body unconsciously (not merely intellectually) learns at a gut level that ecigs will give you your fix. The dopamine instincts that make you reach for an object to cure a feeling will learn to reach for ecigs, this is the key to making this easy, and thus making it work.
From here, assuming you have solidified your intent to use it as a way to quit, you just keep ecigs nearby and vape them hard when you crave a cigarette. Try not to smoke for a week or two. Gradually lower that nicotine after you have formed a habit with ecigs. When you finally go back and smoke a cigarette and it tastes like sucking on an ashtray of harsh burning death, compared to delicious ecigs, you are in the home stretch.