I wonder if the drinking habits are similar as well?

At least in Scandinavia they are likely to be - although problem drinkers probably skew toward the men a fair bit.

You would have to be careful dating in Scandinavian countries as you are likely to find a beer swilling chain smoker in the under 30's age categories anyway.

In my experience, very few in Scandinavia are "careful" in pretty much anyway :D