I've been very happy with EMDCC's. Ego Mega Dual Coil Cartomizers. These won't work on just any 510 threaded battery, they have to be eGo (or clone) batteries with the extra set of threads. Or you can get an adapter.
I tried some normal cartomizers, and found them a major pain to fill/refill, and they didn't hold much fluid so using them was a major pain. I was a little happier with ego T type A tanks, and was planning to try the type B's (which are bigger) when I heard about the EMDCC's.
The EMDCC's are cartomizers, but much bigger. A lot bigger. They hold more fluid, they give a lot of vapor, and they work very well. They are $2.79 each. They seem to work for me for about 10-14 days, then they start getting clogged up. I'm mostly using Boba's Bounty, which is 100% VG, and a fairly dark color. In theory, that means that it should clog things up fairly fast, so you may get more time out of your juice before they clog.
I've cleaned them out and reused them, but my results there are hit or miss. Honestly, I don't mind paying under $3 a week for them. Considering what I was paying for my 3 pack a day habit before I started vaping, that's nothing. And if you fill one with juice and find that it's not working right after cleaning, you probably wasted $3 worth of juice. I'm pretty much ready to stop cleaning them and just dump them after they start to get clogged.
One thing about the EMDCC's, you don't want to use them to try new flavors. Filling one takes a lot of fluid, and if you don't like that flavor, you've wasted it, plus you have filled your EMDCC with something you don't like. So I also have an atomizer/drip tip set up. I use that to try flavors I'm not sure of. I only fill an EMDCC when I know I like the flavor.
EMDCC's can be ordered with two different types of mouth tips. A round tip, which I hate, and a flat tip (similar to an old fashioned whistle) that I like much better. The tips can be moved around from one EMDCC to another, so I suggest that if you order some, get at least one of each type in your first order, that way you can try both and use the one you like best.
www.madvapes.com/eGo-Mega-Dual-Coil-Cartomizer-Flat-Tip_p_3225.html
Don't feel bad about smoking, just keep at it. There is learning curve to vaping, but you'll get there if you just stick with it. You have to find flavors you like. Some people like a lot of flavors, and others have to try a lot of flavors before they find anything they like. You have to learn about equipment, and how to refill your tank or cartomizer, stuff like that. You have to learn how to take in the vapor - if I vape like it is a real cig, I get coughing fits.
When I first started, I was told not to push to quit cigs, and that I should vape when I wanted to vape, smoke when I wanted to smoke, and it would come naturally. And for the most part, that's been true. I was a *very* heavy smoker, for 30+ years. I started vaping July 15th, about 11 weeks ago. I didn't expect to quit - I'd tried quitting many times, never got anywhere, so why would I expect this to work? I was convinced I was going to smoke until I died. But I did think that maybe it would help me cut down.
Almost immediately, without working at it much, it cut down my cigs to about 1/2 of what I'd smoked before. (3 packs a day to 1 or 1.5 a day.) After a couple of weeks, I started noticing that a lot of the cigs I was still smoking were out of habit, without thinking about it. And the really cool part was that I would often light a cig out of habit, take that first puff, and immediately think "Darn, I didn't mean to light that. I don't need it. I could have just vaped!"
When I started realizing that, I was amazed. And before long, I started keeping my cigs a little farther away, where I couldn't grab them out of habit. And that got me down to 10 or 15 a day.
15 a day, or less? Before I bought the eGo, I was smoking 60+ a day. I was pretty stoked.
But I did have very strong cravings right after eating, and just trying to vape through it didn't seem to help. Mornings weren't a problem for me. I don't usually eat breakfast, and if I do, it's usually very light. I'd get up, do my stuff, and I'd be fine until I ate lunch. But after lunch, I had to smoke, or I'd get cravings, and they wouldn't go away.
So I was pretty happy with how much I'd cut down, and I was saving money by buying 25% of the cigs I was buying before (which more than offset the cost of the vaping stuff.) But I was still smoking.
I'd been using 24mg juice. For Boba's Bounty (my favorite) that's the highest they sell it in. Last weekend, I went shopping and ordered several small bottles of juice, all in 30mg flavor. Now I'm using the Boba's Bounty as my all day vape, and I'm using my atomizer/drip tip set up with the 30mg juice when I get those "after a meal" cravings.
And that helped me turn the corner. My last cigarette was Thursday around 6:00. I didn't even plan anything out - I'd smoked a few on Thursday, didn't think anything about that particular cig. I'm not really sure of the time - it's my best guess.
It's been roughly 56 hours since I smoked. I have cigs here, part of pack that I've opened plus 5 more packs in the carton. I hadn't really planned to quit just now. I was really planning on working my way down to a 5 or 6 cig a day limit, and doing that a week or two before I tried going to 0. It just sort of happened. Once I could get through the after eating cravings without a cig, it was pretty easy to just stop.
I think it's far too early to say I'm a non smoker. I may smoke tomorrow, for all I know. But I keep getting closer to being a non smoker. It just seems inevitable that it'll happen. I've shopped around, and will be purchasing a Buzz Pro at some point, probably with a liquinator tank to go on it. Between them (and with batteries/charger) that's around $200. But considering what I was spending on cigs before, it's pretty easy to justify. And if it keeps me off the cigs, as I believe it will, then there are a ton of other benefits.
If vaping can help me quit, it can work for anyone.
Just go at your own pace. If you smoke, fine, you smoke - but that doesn't mean you have to quit trying. Once you find a flavor you like and a hardware setup you like, you can get there. If necessary, you can bump up the nic level like I did, at least until you get off the cigs.
Just stick with it.
Thanks for the update! 
