I think all this should be taken with a piece of salt. 'reduce millions of people's amount of pain'... What do you think someone who has cluster headache will try when they say you will eat anything including shoe polish to diminish it? Most certainly psychedelics like LSD. If it works, good for them. I'm sure their miles will vary, otherwise much more progress in the treatment of things like cluster headaches would have already been made, both clinically and legislative wise.
My point being, the war on drugs in not really a blocker in this subject.