well at least I don't have to worry about alzheimer's in my future

From MSNBC

New research shows that the active ingredient in marijuana may prevent the progression of the disease by preserving levels of an important neurotransmitter that allows the brain to function.

THC is also more effective at blocking clumps of protein that can inhibit memory and cognition in Alzheimer’s patients...

There's more to the article but you get the point.