Although Turkey is a Muslim country, the national drink is alcoholic.  It's called raki and is licorice-flavored.  From what I have seen, pretty much everyone here drinks alcohol.  This may not be true in the countryside or in the more religious areas of cities, but at least in Istanbul there does not appear to be any sort of stigma against it.  In fact, one friend of mine worked at a university which was so committed to being secular that at staff parties the dean would walk around checking people's glasses to ensure that everyone was drinking alcohol.