Technically any drugs, be it alcohol, cigs, or pot, are against the tenants of the Buddhist religion.
However, its not something where they say that you will burn in hell for doing it, they simply state that to reach true enlightenment, you are not supposed to do them. They affect your mind, they alter your mind, and doing that is supposed to prevent you from being able to acheive true enlightenment and such.
That being said, there are known sects of Buddhist monks that use alcohol/drugs, and I havent met a Buddhist yet who has said a negative thing towards them or personal use of them, just that they believe using them makes acheiving true enlightenment near impossible.