The best book I have read in months of research on medical cannabis is actually 15 years old. It was published by a PhD, in 2001, by the Oxford University Press. Unfortunately, too little has changed since then.
The author is a scientist frustrated with the silliness associated with researching a medicine that has been used by humans for literally 500 years. It’s work a read, and can be found for free here. Medical marijuana can be a huge help, but publishing and Federal grants are focuses for the most educated amongst us.
That’s a free version of the book. Please read if you have the time.