Cannabis could hold the key to preventing neurodegenerative diseases like Parkinson's and Alzheimer's, as it contains a chemical that protects brain cells against aging, according to new research.

What's more, the 'miracle compound' CBN (cannabinol) is non-psychoactive. In other words, it doesn't get people high.

Senior author Professor Pamela Maher said, "We've found cannabinol protects neurons from oxidative stress and cell death—two of the major contributors to Alzheimer's.