It worked for me, but none of my friends. Just randomly deciding to never touch i again. A book i read that reminded me of the struggle, oddly enough, is The End of Overeating. http://www.amazon.com/The-End-Overeating-Insatiable-American...
Six years out, I'll say this. The "knowledge" of the smell never goes away, but the craving does, slowly. That is, I smell it, and I remember what it means, I know I want that sensation, but at the same time, I've had my peace with it and know it's not not for me anymore.
On very rare occasion, i'll end up inhaling tobacco (if it's combine with something else that i rarely smoke) without my knowledge. At this point the sensation is very very uncomfortable. While it is pleasurable, it's totally overwhelming, my heart races and everything is too intense for a couple minutes. Very odd feeling.
The book 'The End of Overeating' says that modern food is engineered to maximise this enjoyable aspect of food, to make it hyperpalletable. (It feels like a reasonable book, the biases are clear, it's just popsci so it's a bit flaky in parts and obviously a bit sensationalist.
(http://www.amazon.com/The-End-Overeating-Insatiable-American...)
"Dr. Kessler shows us how our brain chemistry has been hijacked by the foods we most love to eat: those that contain stimulating combinations of fat, sugar, and salt"
http://www.amazon.com/The-End-Overeating-Insatiable-American...