I smoked since i was 14 (now 38), up until a couple of years ago and smoked around 15 a day.
Some people can do it cold turkey, that is fine, I could not. I had zero will power and to think of quitting would see me light up!! I bought a cheap e-cig (looks like a cigarette) and it was rubbish and I was gutted. I then bought a proper one from totally wicked (Tornado C I think) and from the moment it arrived i didn't need to pick up another real one. Over the next 6 odd months I kept dropping the levels of nicotine in the fluids and then I was down to zero so just left with the habbit of picking it up.
One day i was busy and didn't use it, so the next day left it at home, and never touched it again.
I heard all the stories about lapsing and cravings, well yes, you occasionally want one, but that pang quickly passes.
Cold turkey is ok for some, but for me, No, but the e-cig gave me a way out and was so much like smoking it just seemed and was pointless to switch back. If you fall, get one, a good one and ween down the levels over a few months and you'll find you never feel a real need to pick up a cigt again. I can now stand in a room with people chuffing away and have a beer without even batting an eyelid.
I will say that if you do use this method then ensure you still only use it when and where you smoked and not sit chuffing all the time as to get free, you need to ween off it not build your dependance on it, an error many seem to be doing and becoming a heavy vapour.