I haven't opened the link yet, but I do know that LSD was effectively used to treat alcoholism in it's early, legal, therapeutic trials (before it became scheduled).
On another note, LSD "single handedly" allowed me to kick a nasty methamphetamine habit many, many years ago. One exceptionally heavy and terrifying view into my self destructive behavior kicked my habit in one night, and I've never touched methamphetamine since. It's been about 20 years now. I will always credit LSD with saving my life.
I am not a drug addict seeking escape from reality. I am an explorer of consciousness challenging consensus reality.
…is DMT dangerous? The answer is only if you fear death by astonishment… [crowd laughter]… Remember how you laughed when this possibility was raised… a moment will come that will wipe the smile right off your face.
-Terence McKenna