Bongman
I stopped nine months ago.
I kept myself very busy for the first 24 hours, and kept doing the "i'll go for one in a bit" thing.
Didn't tell anybody so nothing to prove, did it by stealth.
First couple of days when walking the dog i took a cigarette with me and lit it, inhaled only into the mouth then blew straight out, then chucked in the bin.
The craving lasts for 3 minutes, ride that out and you're ok until the next one, just keep telling yourself "not this time, maybe next time", and before you know it a week is over.
Don't worry about the weight, i developed a craving for chocolate ice cream, go with it you can sort the weight later.
Sorry for the long post,but it can be done, i had smoked for the best part of 30 years, packing up is the best thing i have ever done, can't stand the smell of them now.
good luck, if you don't crack it this time don't be hard on yourself, just keep trying.