. >> up next, booktv sat down with george washington university professor marcy norton to discuss her book "sacred gifts, profane pleasures." this is about 20 minutes. >> george washington professor marcy norton, where did snickers bars and marlboros come from? >> well, we have to go way back in time. tobacco and chocolate are both native to the americas and were developed by indians. tobacco in the distant past, several thousand years bce and cocoa which is the raw central ingredient to chocolate, likewise, maybe around 3,000 bce and so they were central to native americans. and when europeans -- europeans had no knowledge of them until they arrived starting with columbus in 1492. and went from there. >> how were they used in these ancient cultures here? >> so tobacco was used in a whole multitude of ways. it was smoked cigars, pipes, sort of like substances also used topically as medicines, snuff through the nose, enemas, a whole host of applications sort of varying depending on the region. chocolate had a more restricted domain but what's really important is that it was a beverage,