NOTE: Some of the newer models combine the atomizer and nicotine cartridge in one neat unit, eg BUD Atomizers.  The advantage of this is that you always have a fresh atomizer instead of a single atomizer that can become clogged and less efficient over time.  A fresh atomizer will insure that you get the highest volume of vapor on each puff, adding to a more satisfactory smoking experience.

Let's go over what each component does:

1. Atomizer. This heats up and vaporizes a mixture of liquid nicotine.  The sensation of inhaling this vapor is very similar to real cigarette smoke but without the same health risks.  It even has a warm feel to it which adds to a realistic experience. The vapour produces a cloud that looks like smoke but is actually just a mist that quickly disappears.  

2. Battery.  Nothing too complicated here, just a rechargeable battery that powers the atomizer. It is shaped to look like the body of a real cigarette.  The lifespan of batteries varies from model to model.  The lifespan depends on the number of mouth puffs.  Typically you will get 150 - 400 puffs before having to recharge the battery.

3. Nicotine cartridge.  These cartridges are made up of a water/nicotine solution.  A single cartridge is typically the equivalent of 1 - 1.5 packs of tobacco cigarettes.  Different nicotine strengths are available in high, low, or medium.  Most manufacturers also offer a variety of flavour’s ranging from traditional tobacco flavour, menthol, vanilla, chocolate and fruit flavours.

When you inhale through the E-smoking device, the air flow is detected by a sensor in the automatic models. The sensor activates the atomizer, which pulls tiny droplets of the liquid into the flowing air and vaporizes the nicotine. The propylene glycol in the liquid makes the vapour that resembles normal cigarette smoke. The microprocessor also activates a coloured LED (often orange) at the tip to simulate real smoking. And it serves another function, to let you know when it needs recharging.

The electronic cigarette is surprisingly similar to the real thing but without the same health risks.  There is no lingering offensive odour. It's also a lot less expensive than tobacco cigarettes.  This combined with the fact that you can use it anywhere makes e-smoking a sensible and healthier alternative, one worth considering either for yourself or a loved one.

When I first heard about the electronic cigarette my first reaction was that this was a novelty item that wasn't to be taken seriously.  But upon closer inspection I realized that this is an ingenious invention that has the potential to revolutionize the way