Since this is something only for out to bars, and you want a cigarette shape, I would recommend the venerable KR808d-1. Lots and lots of vendors listed here sell kits for ~$30. It uses cartomizers, which you can fill before going out, and they last a long time. Another good model, which lots sell here for about the same price, is the Joye 510. I would also recommend cartomizers for it too, and Boge 510 cartos are excellent. For a longer evening at the bar, I would recommend getting extra
batteries and charging them up before hand, or get a PCC (Personal Charging Case), and depending on how often you hit, they might last as little as 30 minutes each. A bit longer for the KR808d-1, but about that.
If you don't mind a bit of a thicker model, the eGo will last longer. Again, very common model that lots of vendors carry. You could probably get a whole evening on one charge, but generally we carry backups with us.
Many other options exist now, so...
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