Unfortunately, my attempt a while ago eventually failed.
After about 3 months and some stressful days at work that stupid thought that one can't harm brought me down. But while I quickly was smoking the same amount as I did before, I kept doing the sports I started with when I first gave up. This way, I could feel the quick "drain" of the condition - and I've had enough of it.
So I'll have my (second) last one in a minute, wake up tomorrow and do a 3-miles-run first thing in the morning into those crazy first withdrawal days.