You know, there's an old saying in the US, "the one who smelt it, dealt it.". : ) I think these co-workers might be transferring their insecurities about their own drinking onto you. If they put someone else under the spotlight then they don't have to think about their own habits. They always say if you worry that you might have a drinking problem then there's a good chance you probably do. I have one glass of wine or beer every night (at home usually) and have for thirty years. In moderation I think it actually might keep you above ground for a few more years.