I immediately dropped from 24mg to 18mg to 12mg within my first 2 weeks of vaping. I smoked about 1-1.5 PAD of ultralights and sometimes more than 2 packs. I thought I needed the higher levels. I didn't. I got headaches, a tingly kind of "crawling skin" feeling in my hands, feet, legs, and occasional palpitations. When I got to 12mg, that all went away. I was using the Smokeless Image Volts at 18mg... then dropped to 12 when I got the Volt X2s (eGo sized). Now at home I use an APV (Zenesis Mini), and the over-nicced symptoms started happening occasionally if I was sitting around chain vaping. I ordered some of my juices in 0 nic, and I'll mix 1/2 0mg 1/2 12mg to make 6mg and vape that with this particular device. If you're seeing a bigger vapor cloud with the device, you are burning more juice, and getting more nic per pull. Definitely drop the nic.