Vulcans and alcohol have gotten inconsistent treatment in canon. Spock makes a point of saying that Vulcan has been spared the dubious benefits of alcohol (or something to that effect) in TOS, but DS9 features Vulcan port. If you go here and scroll down to the "culture and tradition" section, there's a brief discussion of the matter.

As to whether or not they can get drunk, I think that's up to you. AFAIK, there's no canon evidence one way or another.