I have to admit this is a silly reason not to add a plugin. While I understand the rules, the plugins are NOT listed publicly on the website, they are only accessible via the server's plugin list in the dashboard.
On that note, the name itself does not directly imply drugs or alcohol. If I'm not mistaken, the user can edit the beverages to other names, such as "Kombucha", "Fruit Punch" or "Goblin Elixir"... no harm there.
Also, a user is fully capable of creating an identical system to this using Skript.
A plugin that adds guns is allowed. Minecraft itself has weapons to KILL players and other entities. In general it seems odd to deny a plugin such as this because of the "content" it contains, when the content in real life isn't even illegal, where as killing is (PS Im not saying MH should remove killing, please don't... AHHH NO). I've used this plugin in the past and its quite fun.