I destroyed and threw away almost a full pack of cigs at midnight on March 31st of this year and have used an e-cig ever since. It will be 7 months on November 1st and I haven't craved a cigarette one time even though I was a 2 pack a day smoker for over 40 years. My husband quit at the same time - and we didn't kill each other or anything, we actually enjoyed it.
The thing with e-cigs is you have to get the one that's right for you and it has to be a decent quality. Do not buy the overpriced junk they sell at the mall kiosks, and forget the disposable ones. They're a waste of money and they won't work. I use the Joye Ego, which was mentioned earlier in this thread. There are many forums you can visit to learn about e-cigs and ask questions. People with no agenda, unlike the sales people at the mall, will help you find an e-cig and nicotine juice that's right for you. There's some trial and error involved. I started out on 24mg nicotine e-juice and have weened myself down to 0%. The e-cig satisfies my hand to mouth habit and works for me even when I have a few beers. I love it.
By my calculations, after subtracting the money we've spent on e-cigs and supplies, hubby and I have saved about $2,800 since April 1st. Not too shabby.