Take special note of Para 8,9,10 of Joel's initial post ( I've added emphasis):
".....Finally, how to stay off, here is another kicker. Almost every piece of professional literature on smoking cessation produced over the last 30 years will bury one line in the text, or sometimes make it really obvious that will undercut the most truly motivated and educated smoker. The line is "don't let a slip put you back to smoking." That makes as much sense as don't let a drink put you back to drinking to an alcoholic, or a heroin addict given the message of don't let a little injection put you back to using. The message needs to be stronger than that, not don't let a slip put you back to using, the message had better be--DON'T SLIP!
There is no such thing as a slip, or an accident, or a mistake, or a puff, or just one, they are all a RELAPSE! This point, more than anything else is what is going to make a quit last. Forgetting this concept, or worse, never knowing it all but assures failure.
I have seen the education of the smoking problem work thousands of times in getting people to be properly prepared to quit. Again, that problem is more than just the physical dangers of smoking. It entails the smoker developing a full appreciation of the physical, mental, social, economic, and esthetic implications of smoking. I have also witnessed the understanding of these issues to be the tools utilized by thousands of ex-smokers in keeping their quits going as long as they keep the understanding of all these issues at the forefront of consciousness."