If you've tried will power and logic, and that still doesn't work, you could try a physiological response. I did this for a chick that was trying to quit. Get about a pack and half of your favorite brand. Tear all the tabacco out of the cigs and put it in a small pot. Add enough water to bring it to a boil. After it's cooked for five minutes or so, strain out the fibers and slam it. The rule is that once you've downed the nicotine tea, you can't have anything to drink or eat for an hour. You will get sick and probably die, but that's where you're at now, so what's the difference except this way it will happen much faster. My friend got really sick to her stomach, but lived. From then on, every time she smelled a cigarette, but most especially with her favorite brand, she got sick to her stomach. In psychology I believe they refer to it as taste aversion.
