Gluttony

Gluttony is the inability to control one's appetite, and is one of the Seven Deadly Sins. Today it is most associated with overeating, but in Medieval times, drunkenness was considered a prominent form of gluttony (this might explain why the punishment for gluttons in Dante's Inferno is eternal rain).

In modern times, the categorisation of alcohol abuse as gluttony could also be extended to encompass addiction to drugs as well.