"So, Sir Rodin, at last you have come to face me, Kheldpar, Blackgaurd of Ashmire! This is a moment I have been waiting for since our fateful meeting at Geston's Point. Two of us shall enter the battlegrounds, but only one will walk away."
"(giggle, giggle) You know what man, what's all the fighting about anyway? I've got a better idea. How about we both just sit down and mellow out for a while? Here, turn up that Pink Floyd at little bit. That's better. Hey, are those trail rations you've got there? Oh man, are you gonna eat those? I'm so hungry."
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I'm not entirely against drugs in D&D, although they don't really have a big place in my campaign. While I see how they could work as a plot element, inclusion of their stats seems like it would encourage immature roleplayers to be...well...immature.
The last thing I want to hear about is how some munchkin's psion smokes weed.
PS: Hidden drug use in literature is one of the silliest things I've ever heard. How do you have hidden drug use in a book? If the author writes "He smoked tobacco" then that's what happened. Whatever happens in a book is, by default, true. What I mean is, if Tolkein writes "Bilbo put on his hat" then that is indeed what happened. It is not open to discussion.
To claim that the author really meant marijuana is like saying that Frodo Baggins is really a Pigmy Cookie Chef. Sure Tolkien says "Hobbit," but that's not what he MEANS. Sheesh.