Okay, not to be too serious but...
It is my understanding that the majority of the Duke family wealth was acquired via their investments in energy not tobacco. Once again, I cannot cite a source, but I distinctly remember reading this as fact somewhere. My problem (actually just one of many problems) is that I read so much I can't possibly remember when or where I read something.
If I'm wrong, I would appreciate someone setting me straight (that's one sentence I would never type on the PPB).