I was quite a large drinker around three to four years ago, a state not helped by the environment where my friends all got together just to drink. I did have fun, other times I let myself go in a frenzy of drinking. It took a five day drinking binge of a large amount of alcohol to make me realise that I was wasting my life. The next day, after returning from the trip we were one I gave up alcohol, and have been completely sober since. The same friends at the time practically disowned me based on my new found position, one that one was not forced upon them at all, and set their life goals as to getting as drunk as they possible can each night.
Each time I run into these friends nowadays they're laying around wasting their lives, and are usually extremely drunk. I, on the other hand, have become far more healthier, have accomplished a lot more and am more in control of my life then I would have been had I continued to drink.
Thats not to say alcohol is a bad thing, its a persons choice and if they succumb to it, it is there own weakness. Its like any other drug. Once it becomes an addiction or your only goal in life is to do it as much as you can then you're no longer living your own life. You're wasting it and a slave.