The units (e-cigarettes) that you FILL yourself are more substantial, last much longer and most seem to prefer them, though the small cigarette sizes like in stores now are convenience. There also are e-cigars, but they costly and gimmicky.
IF you go to "fill your" own e-cigarettes, buy your nicotine liquid from a e-shop, not a C-store. They tend to dilute the nicotine liquid - or so word is out to that effect.
The refillables (good ones) are larger and cost more, but cost far less in the long run. The batteries (rechargeable) last longer and the only cost is replacing the "wick" every month or 2 for about $3. Much less expensive than cigarettes - and less expensive in the long run than buying disposables.
I bought it at a mall e-store for $110 - but this is the pipe for half price. If you think that's high, think of the price of a cartoon of cigarettes.
It has a very nice, substantial feel to it. Fits nicely in your hand. And not so easy to lose. The batteries are rechargeable AND a standard size - unlike e-cigarette batteries - and should last many times longer than a e-cigarette battery, plus a larger liquid holder - and it comes with an extra liquid holder you can just swap in - plus an extra rechargeable battery so you always have a charged one. It best let rechargeables totally drain before recharging them.
Since it comes with 2 batteries - both also a standard size, two "bowls" for the liquid - which means 2 wicks - plus the extra mouth tip it's a good deal. The only thing you'll need in the future is more screw in wicks (very small), but they last about 2-3 months on these and cost less than $5 each.
Hot 618 Pipe Electronic Vaporizer Set Series Old Fashioned Style E Pipe in Box | eBay
$55 dollars for the set, free shipping, from China. Half what the identical set sells for in malls.
I have bought e-cigarettes such as the disposables you see in stores, the kind that you screw on replacement ends, and even the original small e-cigarettes you can refill, tried e-cigars, and now the newer larger refillables that don't look like an e-cigarette. I like this e-pipe MUCH more. Really feels good in my hand and hopefully won't be so easy to lose.
Basically all malls have an e-cigarette booth or smoke shop to buy the liquid nicotine. Guys tend to just want "tobacco" or "pipe" flavor. Women tend to go for the flavored stuff. There are 3 concentrations. If you smoke "reds" - go full strength. If you smoke lights, go medium. The weakest concentration is like nothing.
Give it a try. Buy a cheapie disposable e-cigarette at a store and I think you'd like the e-pipe more.
To get started, "smoke the e-cigarette" when you are a location where you can't smoke - like in a mall, at a movie, in a restaurant - and load yourself pretty good on the nicotine of it - as you'll more want a cigarette. BUT then you are so loaded up nicotine-wise you will want to light a cigarette, but you won't drag on it much and it longer before you want another.
The danger is if you are still doing the same level of smoking and adding the e-cigarette. They you are going to become a real nicotine junkie. While eliminating smokes saves your lungs from more damage, nicotine still will contract your blood vessels and other negative health effects of nicotine - but they do spare your lungs more abuse.