I read a bunch of posts before I started and almost everyone advised to start low and increase nic content if necessary. I started at 18mg and you couldn't get the pacifier out of my mouth. I was sucking on that thing constantly. I upped it to 24mg, same thing. I used to carry two 510s because I'd heat one up so hot but couldn't wait for it to cool down so I'd go to the other one which was 'cooling' in reserve. I'd go back and forth between the two constantly. My wife accused me of developing OCD. Tiring of this all, I ordered 36mg from Totally Wicked and finally felt relief, a 'nic buzz.'
The order from Totally Wicked took what seemed like forever to get here (it was something like 'in process' for four or five days before it shipped), so when I had to reorder I turned to myfreedomsmokes. To my surprise, they offered 48mg. Ordered that, figuring that I could always cut it if necessary.
Bottom-line is that it does the trick for me.

I can take a few 'hits' and put the thing down, instant relief, instant gratification. Add a 6v mod to the equation and I finally feel as if I'm set-up to function as a 'vaper' from here on in. I usually perform these brief 'vap-sessions' at about the same rate that I used to smoke, so, I'll do this maybe 30-40 times a day. I go through somewhere between 2-3ml of juice per day.
I realize that some enjoy the act of vaping and would prefer to 'draw' their experience out so that they vape more frequently and longer. For me, after the novelty of the thing wore off, I just wanted to quell the nic fits and get on with what else I have to do.
Consider going to a higher nic juice and a mod. As I said, you can always cut the nic content down if it's too much for you.