If you're giving up smoking, you've probably already tried (or at least heard of) electronic cigarettes - a reasonably effective way of getting hot nicotine into your system, without any of the tar or nasty cancer-causing carcinogens which come along for the ride with conventional cigarettes.
Unfortunately, the cheap ones available from petrol stations and mall kiosks don't last long and produce a negligible volume of vapour.
The more expensive models can produce decent vapour and have a more reasonable battery life, but they are not cheap, and even spare parts come at an inflated price.
This instructable will show you how to build a very powerful vapour machine with long battery life from a flashlight.
The build time should not be longer than a few hours, but significantly less if your fingers are nimbler and your soldering skills are superior to mine.
Step 1: Step 1 - Acquire your materials
A dead e-cig battery - I am using one from a Janty Ego, but others will work as they all have the same basic layout.
An aluminium bodied handheld torch - I am using one from Wilkinson (£2.99), but Poundland ones work just as well.
An 18650 rechargeable battery.
A soldering iron (and solder)
Plumbers mate putty.
About an inch of thin (and I mean thin) insulated wire.
An atomiser or tank system. I recommend this one: http://www.totallywicked-eliquid.co.uk/products/replacement-coil-systems-2/dc-rcs-series/k1-dual-coil-replacement-coil-system-product.html