Are Smokeless Cigarettes the Cure for Cigarette Addiction?

I’ve seen the ads, and I was intrigued. I’m not a smoker, though I could be. These smokeless cigarettes look like traditional cigarettes, and even emit a small white cloud (actually water vapor).
Why bother? There’s a handy nicotine cartridge inside to get the fix you’re jonesing for. However, you are avoiding the rest of the toxic soup (you’re missing out on 3900 chemicals) contained in a traditional cigarette and they are cheaper than buying a pack a day. And you get the same physiological response from going through the motion of smoking. So are they the solution?
The advantages are clear – you can lower your nicotine use, and even choose no nicotine cartridges. (The cartridges also come in cool flavors, too.) Technically, they aren’t smoking cessation products, but a number of people are claiming they’ve used them successfully for that reason.
The only theoretical harm I could think of is these could be used as “gateway drug” by non-smokers. In other words, they start “smoking” these, and get addicted to the nicotine and switch over to the real thing. Still, I’d rather anyone I loved to smoke these instead of a traditional pack any day of the week. I’d still encourage them to switch over to the menthol or herbal flavored cartridge, though.
If I had a cigarette habit I wanted to quit, I’d start here.