e-Cigs CAN BE awesome! I use the KR808-D1s &
We don't do links to sources
I found the 3 piece ones to be cheaply made & even the 2-piece batteries can vary.. the links above are awesome & you can order, at most places, batteries that are "manual" that seem to work far better that the automatic ones.
You really need about 3-5 batteries & a good "Passthrough" that is a USB plug-in that if you get the right brand, works great!
The KR808-D1 batteries w/ cartomizers seem to be the best I've tried. They sell them in the malls & some smoke shops. I hear some of the higher-powered "Mods" are great, & last longer than the 808-D1 batteries... The 808-D1 XL batteries are awesome & do last longer & can be charged on the Personal Charging Cases that also plug into a USB port, but the XL batteries don't let you close the charging cases.
For about $150, you can get 3 batteries, the chargers AND a 30ml bottle of e-Liquid, wall chargers, etc & keep them rotating, so you'll always have a battery charged.
Where I live, you can "Vape" in most bars & if you get the batteries with the green or blue LED lights, you can use them darn near everywhere.
A state or two is trying to outlaw "vaping" indoors & I think one state already has in public places, but most non-smokers I've talked to like it better have no complaints AND you can vape away!
We have a group of people that put orders together to try different flavors & save on shipping. We've even had "Vapor Parties" so we can try the different batteries, cartomizer flavors & fill our own empty cartomizers. That way, if someone doesn't like one flavor, inevitably, someone else will.
I was reluctant too, but have found different places carry what I & others like, so we make orders together. A 30ml bottle will last you quite aa while..
One tip... If you "burn" a cartridge, just toss it... they are FAR too much work to get the burned flavor out of them & they are cheap to replace... about $9 or so for a box of 5 cartomizers. Sometimes you can find sales where they are even less. Some places have mixed packs of flavors, so you can try 5 flavors per box before ordering a bunch of the liquid & you can also get 5 & 10ml bottles to try different flavors.
The KR808-D1s seem to be the standard around here & online. (The regular KR808s are the shorter batteries with a shorter battery life)
I've tried the "501's" (The 3-piece eCigs) & didn't like them... There are a few brands of "808" batteries that are like sucking on a hose... I listed the places where I've tried & liked these w/ links for them.
There is a lot of info on the eCig forums about who likes what & why.
Some of the "Mods" run at 6v & are a little hot for some of the eJuices & cartomizers. There are places that sell eJuice that is made specifically for the mods & I know my "passthrough" (USB eCig) runs better on the eJuices made for the 6v mods & passthroughs.
I hope this helps! It can be trial & error. I started with the auto batteries & found I like the manual or push-button models better... just a personal preference I suppose.