Well the game Morrowind has for example alcohol as a \"potion\" you can drink. But they aren\'t called \"Beer\" or something like that, they\'re called for example Sujamma. Thats the best way to include \"bad things\" (like alcohol, drugs and tobacco) into RPG\'s, just to make up names for them. Most \"children\" won\'t even know what it is if they\'re called something else. Then make the \"bad stuff\" decrease agility or intelligence on the character.