Experts say they've made a discovery that could lead to new therapies to treat Alzheimer's - and the starting point is cannabis.

(CNN) - Could medical marijuana treat Alzheimer's patients? One recent study found THC, the psychoactive ingredient in cannabis, stimulates the removal of toxic plaque in the brain, a common feature of the disease.

Salk Institute scientists have found preliminary evidence that tetrahydrocannabinol (THC) and other compounds found in marijuana can promote the cellular removal of amyloid beta, a toxic protein associated with Alzheimer's disease.

It's going to be pretty hard to keep weed illegal when your grandparents are smoking it to prevent Alzheimer's.