When should you say something about someones drinking habits?

Asked by livestrong (213) November 29th, 2011 from iPhone

My best friend recently started dating this guy that was one of her first loves as a kid.
After 10 or so years, they’ve re- connected, and are really into one another.
He drove 18 hours from where he was currently living to  visit her, and they hit off, and have now started dating.
He’s moving next month to an area much closer to her.
He drinks and smokes, she does not.
That being said, she’s a big advocate of ” do what you do” and does not want him to change
due to some sort of way she may or may not feel. She feels when you date someone, you take on a person, as they are.
The only thing that bothers her is that he drinks every day.
She said: it’s one thing to get crazy on the weekends but to drink 3,4,5,6 beers a day just doesn’t sit
well with her, even if it’s just beer.
They’re both in their young 20’s.

Do you think she should mention something, or leave well enough alone?