Ok back in 2014 I purchased a uno vapor 1500 mah battery and a tank worked for about a month and then the pull started to bother me felt like I was trying to suck a marble through a straw. So that was that smoking was easier.Since then I have researched and read read read about why it did not work. My outcome was wrong tank wrong power. Got to get off the mans back so I purchased a rx200 and a crown tank OH my god now I have coils to figure out . The crown tank came with a .50 watt coil a .25 watt coil and a .25 ni heat coil . So what coil would be best right now I have the .50 coil in and I feel something is missing. I smoke a pack to two packs a day purchased 12 mg e juice because I found out in round 1 18 was to much. think its coil what would be a good start.