I can totally respect those who choose not to drink - it can be a difficult choice among certain social circles. Yet I certainly don't condemn those who do, though I wish a certain % could/would turn it down a notch - those who define their lives (social or otherwise) through alcohol consumption are unfortunate.
As for myself, I started drinking (relatively) late in life (23) and drank lightly - as I more enjoyed the "herbal" solution. As time went on, I found myself drinking more and smoking less. I rarely drink at home - it is strictly a social activity.
I also have a mild allergic reaction to alcohol (I get flushed and hot), which has helped me to moderate my alcoholic consumption, though it manifests itself erratically. Still, all my scars glow all red as the allergy progresses, so I can look down at one on my wrist and it is an alcoholic "Logans Run". I used to hate it, but I now love the fact that it has kept me responsible with alcohol (as a rule).
Still, I enjoy going out and having a few drinks, as I am kinda shy, and enjoy the "social lubricant" aspect of drinking. The strange thing is how different people's reactions are to alcohol. Some get so drunk, others not so much - some are obnoxious or aggressive, some are calm or hilarious. Personally, I lose motor-coordination first ( I walk poorly), but have a clear-head till the very end. There have been so many times where people have all nominated me as the person to drive everyone home until we all get up to leave and I am walking like I am on a rolling ship. Ah well...