This made me chuckle right out loud
going out to smoke a fag. It doesn't really mean they have became a bloodthirsty maniac trotting off to commit murder.
I too have quit many times, each time I got pregnant, for instance. But I always started up again until after my last son was born. The the smell of it and the inconvenience of having to go outside finally gave me the impetus to finally quit.
I think of starting up again from time to time...
The going outside thing was definitely a kicker for me. Its amazing how it can be the small things that make you make a big decision! Standing in the rain and cold in Scotland is never great at the best of times!