This is entirely based on a lifelong set of my own observations, so feel free to correct me if you think I'm wrong but..
Why is it that incredibly introverted or socially anxious people are the most likely to avoid drinking alcohol?
I feel that engaging in such an activity is a good way for me to feel more comfortable in a situation that could potentially be awkward. I am surprised that many of the people who have the greatest problems with social situations are the ones that are usually so adamantly opposed to drinking it.
What are your thoughts?