Right, people that have never smoked couldn't understand how in the world I could still smoke but, it is so very addicting.
I've often thought that it was the 48mg/ml Vuse cartridges that kept me from being a dual user. As bad as they tasted, I do credit them for my success that first three weeks.
I was the other way around, which is why I believe that in some cases, the problem is that the liquid is too strong.
The first ecig I tried was back in 2003 (again in an attempt to be able to 'smoke' in prohibited areas) and it was a 48mg one.
I figured that since I smoked a lot, I'd want a nice strong one.
Turned out it just gave me palpatations and made me feel nauseous, and I threw it away.
When I tried again, I used 12mg liquid, and although it wasn't as strong as the cigarettes I smoked, it didn't make me feel unwell.
All I had to do was vape it for a little longer until I absorbed the amount of nicotine I needed, and that's what worked for me.
I got to spend some time enjoying it like I would a cigarette, and it only took a couple of minutes longer to get my nicotine.
Vaping slightly weaker liquid allows you to creep up to your satisfaction level and ensures that you don't overshoot it either.