It is an opioid, that many people get quite dependent on. Methadone is an opioid that helps people get off heroin, it also has people that get addicted to it.
Just because something, when used a certain way, has positive benefit doesn't mean it should just be sold to anyone that wants some.
Just because something, when used a certain way, has positive benefit doesn't mean it should just be sold to anyone that wants some.