Like I said before, I'm sure there's something about everyone's partner they wish that they could change. The fact that you stay with them regardless of the habit proves that you accept the person but just not fully the habit. Naturally, you're just going to look out for your partner on things that you feel may be harmful to them because you care about the person. It probably would even be that big of a problem unless the habit out out of hand or it did turn into a "nagging every 5 minutes" thing. Just both sides have to understand where the other person is coming from
Oh and here's more:
http://www.jrussellshealth.com/alcohol.html