Pass Me That Bong

Good news for aging hippies: smoking pot may stave off Alzheimer's disease.
New research shows 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.

The bad news is that pot smokers also suffer from memory loss, impaired decision-making and diminished language skills but these symptoms are due to being stoned rather than having plaque on the brain.