Nah.
American Drugs in Egyptian Mummies: A Review of the Evidence
I have believed that there was much more intercontinental travel in the past than the historians can account for. Odd stuff turns up all over.
What bothers me with the nicotine-cocaine mummy issue is that there was no evidence of Egyptians cultivating the plants, or any record of their use or sale. No pictures on the wall of either plant. The Olmecs, on the other hand, had pictures of both plants plus mushrooms, olliloqui, caapi vine, and a number of other entheogens, making it clear that these plants were known and used.
Another oddity is economic- say that they went over to America in reed boats or whatever. If they brought back tobacco and coca, why not corn, potato, tomato, capsicum?