I dropped the butts the first day I had my ecig, and haven't looked back.
That week between the order being made and receiving it was spent talking myself out of the cigarettes. Noticing every cough, grumbling to myself every time I emptied an ashtray, just telling myself over and over how much I hated the butts. It helped a lot to put me in the correct frame of mind for the switch.
Once we got our stuff, we vaped A LOT. Every time I thought about a cigarette, I vaped. I took it outside for cig breaks. I kept it in my hand at the computer. Made sure it was ALWAYS available.
The first week was weird because it doesn't have that same rhythm that a cig does. There's no beginning and end, like a cig. I don't know how many times I tried to reach for a lighter. That was the hardest part, retraining yourself that "THIS" is how I smoke now. After about two weeks, the hard part was OVER. Now it feels like I've been doing it forever.
I wouldn't diss someone who held onto a few security cigarettes - even a reduction is stepping in the right direction. But my opinion? Just drop the cigs, vape your face off as much as you need to, and it won't take long for the old way of thinking to fade away.
NOTE: It's a lot easier if you have sufficient batteries so that you're never high and dry, as well as one or two good flavors that you can turn to. That's why research and purchase planning is so important.
