Besides that I see nothing in the links you provided that support your theory, I salute you for trying to solve a mystery. But if you look at the big picture rather than just a single element of it I don't think it holds water.
You are of course assuming that the accomplished German toxicologist Svetlana Balabanova - who first announced the find of coc aine, nicotine and cannabinoids in the hair, soft tissues, skin and bones of the mummified remains of priestess Henut Taui - didn't see that coming, even though Belladonna was considered in the initial stage of the investigation.
As already mentioned in this thread, the high concentrations of nicotine in the mummies makes it unlikely that it derived from another source than Nicotiana Rustica.
In 1974, fragments of tobacco leaves (Nicotiana Rustica) were found in the abdominal cavity of the mummy of Ramses II in Paris (Layer-Lescot 1985). It created a minor sensation at the time, but it was assumed (by lead investigator Maurice Bucaille) that the tobacco was placed or accidentally dropped there when the mummy was unwrapped in 1886.
In 1982, J. R. Steffan reported that he had found a single specimen of Lasioderma serricorne (commonly called the tobacco beetle) in the mummy of Ramses II. More tobacco beetles (who feeds mainly of tobacco) turned up in Tutankhamen's tomb, and in this case it becomes difficult to speculate in contamination. Is it not a bit too 'coincidental' to find both tobacco leaves and tobacco beetles in a mummy where neither 'should' be present?
Add to this the excellent work of anthropologist Gunnar Thompson on the presence of corn and pineapple in Theban temple art, and we start getting the notion that there are a bit too many odd ends to explain away.
For those who are allergic to the idea of Pre-Columbian trans-oceanic contact, note that we do not need to speculate in ancient established trade routes between Africa and America. We could simply talk about a single Egyptian merchant vessel gone astray that reached Mesoamerican cultures, and that somehow made it back to Egypt with a cargo of plants and seeds. It is within the possible and could explain the presence of these substances in ancient Egypt.
edit on 13-8-2012 by Heliocentric because: a world of dew, and within every dewdrop a world of struggle