I have several acquaintances that do not use drugs or alcohol because of cultural or religions beliefs/backgrounds.
Having said that, what other people do in regards to their alcohol/drug is really not my business to ask. There are statistics out there on drug use if you really need to know ( easily found on google ) but quite honestly I don't think it matters one way or the other. MY alcohol use was not responsible or sustainable so I chose to quit - that's the only stat that really matters to me ;-)