But while smart toilets currently exist -- even if they haven't reached our shores yet -- even smarter ones are in development. Their purpose: to keep us healthy. Some toilets in Japan already perform urinalysis to see if users have diabetes; soon there will be toilets able to detect things like drug use and pregnancy from your urine, plus colon cancer from your stools. Heck, they'll even be able to give us diet and exercise advice.But will we heed it?