User can make themselves drunk

Pros:
-user is immune to alcohol
-user can only get drunk via the quirk
-user can become sober at any time
-user can control their actions

Cons:
-user will randomly make other drunk for a couple hours on impulse
-user is likely to randomly activate the quirk
-user will be unpredictable

Weakness: stress
User is more likely to activate the quirk or down MANY bottles of booze to be numb