Okay, go to the e-cig forum... There is a TON of info on what to do and what to buy. I personally have a lavatube (sucks) and a infinity pro. The infinity pro worked great.. Until about a month ago. The lavatube sucks cause, if you drop it, it's broke. The infinity rocks cause if you drop it, it's fine! Now, short comings of the infinity... Well, I was off (as we call them) analogs until suddenly, I started having issues... Both of these are what's called, variable voltage MOD's. the infinity pro started not reading the voltage setting I pre-configured (for lack of a better term) it for. Sometimes I would get a harsh draw.. Others I would get too little. The problem with this is, without a nice throat hit, it doesn't get the job done. So, I am smoking cigs again, after 1.5 years. Why? Well, ecigs don't make you quit your addiction. All they do is give you a replacement. If you are going to quit smoking, make sure you WANT TO QUIT! Cause if not, your going to end up like me... Looking for the easiest way out, and spending 200+ dollars on something that "could" work, if it was sustainable. Ecigs are not sustainable. You need tons of extra gear and LOTS of extra juice. Run out, and you are in a world of hurt.