"And that's it's not, on its own, harmful." I'm sorry to say, but that statement is incorrect. Even the gwern.net link has a section titled "Health Issues". I

"And that's it's not, on its own, harmful." I'm sorry to say, but that statement is incorrect. Even the gwern.net link has a section titled "Health Issues". I'll add that it is an immunosuppressant, which Gwern does not appear to mention (or I missed it when skimming the link).