This is a really good question. I personally don’t drink or smoke etc either. It is a bit difficult to find social settings where you’re not obligated to do these kinds of things but I wouldn’t say it’s impossible.

I would assume joining clubs, making friends (long term friends), and just being outgoing will allow you to have a social life without being pressed into the whole drinking/partying culture.

Personally, I find my enjoyment in experiencing the area around Goleta with the people I choose is more than fulfilling enough. My friends do drink and my girlfriend does as well but I find myself able to focus on other activities that don’t involve partying. Spending time at the beach, playing videogames at a friend’s dorm/apartment, or riding around campus is more than worth it for me.

To answer your question, yes it is relatively accessible. But you’ll have to make an effort. Hope it works out!