[limey]

I have. Several times. But finally for good, as well. I went cold turkey. I made sure that I had no cigarettes in the house. I made sure I didn't go to places I usually smoked (like the pub, in the good old days) so that I was not tempted by smoking friends. That being said, my live-in partner smoked at that time, and I just didn't. Sometimes I'd choose to go and sit in another room than him, sometimes I just ignored it.
I was determined to give up for good. I don't remember it being particularly difficult emotionally, I just kept choosing not to have a cigarette. Again. And again. Until it was automatic. I don't miss it now at all (five years' stopped).