This is a great thread topic.
My story is I smoked for 30+ years, quit for two, and I've just passed the one year mark again.
When I was smoking, and really wishing I had better will power so I could kick the habit, our [Australian] television was saturated with truly nasty advertisements to make people quit. They showed stuff like amputations from gangrene, squeezing the tar out of a pair of lungs, the plaque out of an artery...you get the picture. These ads were based on guilt, trying to make us feel so bad about ourselves that we would want to quit.
They used to really piss me off because that is not what smokers need to hear. We already feel guilty for the damage we are doing to our bodies, and the risk we are taking with our families. those ads just made me feel more worthless, and more likely to keep smoking.
Well last year they introduced a whole new set of ads which accentuate the positives. Instead of telling us how we are killing ourselves by smoking, these ads tell us how we will heal when we quit. Things like, in two days the nictoine has left our system, in one week your sense of taste and smell improves, in one year you have halved your risk of cardiac disease, in ten years your lungs have repaired themselves [don't take that as a quote, I don't remember the stats exactly]. Stuff like that is what people need to hear.
I used Champix to quit...nasty side effects but works well for people with 0 will power.
For everyone who is trying to give up I wish you well, you are not alone. My one piece of advice would be to use every available source of assistance you can [your GP, "quit line" in Australian, your friends etc] and don't be too hard on yourself if you slip.
Good luck to you my friend.