I have never felt judged but I find when people are doing something unhealthy (like drinking, etc.)--they encourage you to join in. In my case, when I did join in--it was because of my own issues. I now rarely drink and the only reason I am succeeding in this is probably because my husband doesn't drink and I don't keep it in the house.
Though I can think of one college friend with whom the majority of our activities together eventually led to drinking. If I was a nondrinker in college--I would have seen much less of her and there are times in my life where some of the people I hung out with (like when I went to my Air Force specialty training that lasted 8 weeks) were drinking buddies only--not close friends. I would have only seen them in class if I didn't have a drinks with them. I have never thought of myself as socially anxious but now, since reading more about anxiety, I wonder if my past drinking was to make socializing easier for me....
My main "addiction" right now is sugar.

I eat more than anyone else in my family. I am trying to cut back.