Interesting post. There are a lot of things people abstain from, using self-control to rationalize their choice (can you say "40-year old virgin?"). No offense and props to your decision, but I think more often than not, we develop lifestyle habits and develop set of values that reinforce those habits.
Personally, I find drugs and alcohol fascinating - not because they provide a sustainable means of satisfaction or help people deal with their issues, but because they alter a person's perception of reality. It's sort of like a physical "StumbleUpon" that can introduce you to a brand new perspective on life. Whether you happen to like or dislike that perspective isn't the point - the fact is that you get to see things in a new way and better understand what you like and why.
Alcohol is disgusting - no doubt about it. However, I've found that using substances deliberately to play on emotion can provide remarkable breakthroughs in confidence, creativity and even relationships. Use with care, certainly, but it's not ALL bad if you don't look for "cures in the drugs."
Just my two cents. Cheers :)