Experts now say quitting tobacco is as hard as a heroine addict quitting heroin. The line gets finer and finer as to what addictions are harder than others to fight. In my opinion, this is because quitting anything is the same as quitting anything else.
I find it kind of funny how in this age of humanity we look so much towards medicine for cures, that we forget the things we already have. In this case, will power is the subject. Anyone who says they can't battle addiction because it's a physical thing, well so is your brain, believe it or not. Buddhist monks can set themselves on fire in protest, sacrificing their lives, physically overcoming their primal instinct for survival for the betterment of the whole, but some people think they "can't" stop drinking.