Don't get me wrong, I will have a drink. lol Just yesterday at 4pm I had a beer with friends (even having one as I study now.)
I just wouldn't join in on a social drinking night when I have important things to do, I'm afraid. It's not about being an alcoholic, it's that once I start having a drink with everyone, I'm gonna have more fun doing that than studying 30 russian words and conjugations and whelp, here comes the "*** it" mentality. :D
Edit: and to be completely honest, I can kinda understand sometimes people not even having one drink. I went through a 3 month binge every night out of stress/depression (I know, pathetic) and when I quit, I literally had to just deny any invitation out to the bars, refused to have alcohol in my home. It's a control issue, so better safe than sorry for a lot of people, and it helped for me. Eventually I was ready to test the waters again and find I have more control now, but it's not perfect.