You can't kick yourself. It's a normal reaction.
After a "failed"
vaping attempt last summer (I call it "failed" because I kept up on what as going on and am back to
vaping again), I purchased me eGo in January. For 2 weeks I didn't even touch an .... log, but when I went to NYC for 2 days for my birthday, I bought a couple packs of Dunhills (yeah, went classy!) for me and my cold-turkey quit cousin, who had not bought a pack, or smoked much for 8 months, even though I had continued smoking. For those two days we enjoyed (?) - at least sometimes - our cigarettes, and when we returned back upstate, we both went back to smoke free lives - him just not smoking, me vaping on my trusty eGo, and purchasing tons of crazy good juice...
What I'm trying to say is, it's OK to smoke from time to time, even to go through a pack in a couple days (which, now that I think of it, I used to go through over a pack a day), and then return to vaping. Don't flog yourself, don't feel guilty.
When it all comes down to things, you'll be smoke free in no time. IF you feel the urge, and vaping isn't helping, try snus (the swedish variety) or nasal snuff. I have a large tin of snuff that I use when things get real bad. Though I barely use it, I don't feel guilty for using tobacco fromt ime to time.
All that said - try different types of PVs. My eGo was my 3rd device, and I found it to be perfect to me...my 901 and 801 didn't fare so well last year - though both still work, and I do enjoy using them from time to time now, I couldn't see myself using them as a replacement for the nasty cigs.