No, unfortunately, being drunk, *unless* it was somehow inflicted or forced on you against your will, will not enable you to void the lease. That's because while a lack of capacity is generally a defense to contractual liability or obligations, that's not the case when the lack of capacity is self-inflicted; if you put yourself in a state or condition where your capacity is impaired, you are nonetheless still responsible for your actions, including any contracts which you signed. That doesn't mean you can't try to get out of the lease by threatening to disclose that they got you drunk to get you to sign--as long as its true, it's not defamation--and maybe they won't want that publicity; but legally, being drunk because you went to a party and voluntarily imbibed is not a defense.