I know someone who gave up the cancer sticks & ended up addicted to 'nicotine replacements' (gum, patches etc.). Hardly a 'replacement' - you're simply delivering a highly-addictive drug in a different manner.
I was on 80/day until I did a $400 money-back-guaranteed course:
http://allencarr.com.au/
I haven't touched nicotine for 10 years now.
I clearly remember the sensation of being able to smell things again - even those blue cubes in the urinal smelled interesting!
Dean