It has the ability to stimulate philosophical thought.
It Increases how long I'll live for by slowing down my perception of time... perhaps not on a calendar, but my perception is my reality.
Plus preliminary studies are showing that it mighthave the ability to prevent cancer from spreading, so perhaps on a calendar too.
Oh, and I enjoy the buzz, I'd probably smoke it even if none of that were true. It's definitely not improving my eyesight though, totally thought you asked "why do you smoke weed" lol
Life is like a box of chocolates, it doesn't last as long for fat people.