Read Nikki Sixx'book "The Heroin Diaries". It will MAKE you want to quit drugs and booze.
I have been sober (off the booze) for 7 years as of this Dec 4th. I dont miss it, even when other people are around me drinking. But trust me, I still consider myself an alchoholic even tho I have not had a drink since then. It is a disease, but a controllablke one, as long as the person WANTS to control it. It is a lifestyle change.
In my case, I was not a real heavy drinker, just a few (4-6 beers) nightly after I got home from work. For years my wife and I had been trying to have kids. After seeing several specialists we finally came across one that summed it up to my sperm being "lazy" from the beers. I quit that day. 1 year later, we were blessed with twin boys.