The drunks can be classified in to different types such as
Happy mood- people either drink when they are very happy and enjoying.
Sad mood- Some people have the tendency to drink when they are sad.
Pissed off mood- some have the tendency to drink when they are totally pissed on something and they drink put of anger
Crazy mood- when the people are in total freaking out mood they drink and get drunk.
Habituated drunkard- some of the people are so habituated to their drinking habits that they cannot control their urge to drink.
Occasional drinkers- some of the people who jus drink when there is any particular occasion like once a month or something like that.