I started out with the nautilus mini's when I quit the smokes. Bought STM and it was too much for me, so I put it away. During the months that followed I decreased my nicotine. When I went down to 4mg of nicotine in my nauti tanks, I pulled out my STM and got some 2mg nicotine, that was almost 4 months ago. I used the .5 coils. I was ready to switch over when my nic level become low and I was wanting more of the inhale feeling I got from smokes. What ever works for you, everyone is different.