Google: "There are no research studies that prove cannabis, or products such as cannabis oil (CBD oil), can stop, slow, reverse or prevent the diseases that cause dementia."

And yet,...

'Understanding the Modulatory Effects of Cannabidiol on Alzheimer’s Disease' "Recent studies using an AD mouse model have
suggested that CBD can reverse cognitive deficits along with Aβ-induced neuroinflammatory, oxidative responses, and neuronal death. Furthermore, CBD can reduce the accumulation of Aβ and
hyperphosphorylation of tau, suggesting the possibility of delaying AD progression."

...Except that the research was done overseas. The Drug War prevents research in the U.S. on cannabis whether it's Alzheimer's or cancer or anything else. Google's statement only stands in this context. The point is that cannabinoids affect the endocannabinoid system (ECS) which is a critical immuno-neurobiological system.

[mdpi.com]

It's as ugly as can be...