But the mysteries still exist. Parkinson's disease, Downes Syndrome, the brain. Perhaps the biggest tragedy of all is when an important medical question has not been answered, but most everyone thinks it has. That's a tragedy of a different sort. No doubt in my mind.
Cigarettes cause lung cancer.
Learned that a dozen years ago in school. Everyone knows that. Most people we talked to believe smoking causes lung cancer. But medical science isn't so sure. A good many scientists do feel that cigarette smoking causes lung cancer.