Come to think of it I did have occasional urges too, but I was determined not to smoke. I know for sure that I haven't had any urges for at least the last two years. I do remember having some 24 mg around (thats what I started with) for the times that nothing seemed to cut it, but all I do now is 16 to 18 mg. Man, 24 mg reminded me of my High school 'nic buzz' days lol
edit;
I think there is something besides nicotine in those cigs that addict you too. 
I was getting plenty of nic in the early days, but something else was still missing. Good news is after about the first few months, I didn't seem to miss it any more