I know people who are on medication and who shouldn't drink but they still do. This seems a lot more confusing than if someone said they were on medication and so don't drink. I think the reasons for not drinking can be kept private. There are a lot of reasons why people don't drink. I didn't drink for 10 years and never had to give an explanation. I just didn't drink, and usually put in an appearance at parties but didn't stay really late. I then went back to social drinking. I am ready to again be a non-drinker because the lifestyle was nicer. It was nice to not be overexposed to people who drink because invariably someone ends up drinking too much. So how would I tell people, "Oh, I don't drink because I would like to avoid drunks."? Discretion is best. Classy and mature people don't question a person about why they are not drinking. (I didn't drink because I felt better when I didn't put alcohol in my system. It was that simple.) It's kind of unnecessary to pretend drink or lie about the reasons for not drinking. The bottom line is people don't care all that much.