Michael DeBakey: At that time, we were involved in the study of cancer of the lungs. And on the basis of our studies, we became convinced that there was a linkage with tobacco smoking. We didn’t know exactly what it was, all we knew was that statistically there was a linkage. Even today we don’t know. We aren’t sure of the exact reason, but there is a great deal more work that has been done to confirm the fact that there is a very definite linkage between smoking and cancer of the lung.