You’d have to know what it was that was actually found, since the Cracked article isn’t reliable.
The biggest problem with it is that it states that “tobacco and cocaine were strictly New World plants”. But the fact is that both the tobacco and cocaine genera are Gondwanan, and as such are found in Australia, Southern Africa and India as well as in the Americas.
Tobacco use was widespread amongst Australian Aborigines and Polynesians. We know that at least one species of tobacco, N. fragrans, that is native to Northern Australia and New Guinea was distributed across Melanesia and Polynesia and as far afield as the Marquesas in the Pacific and Namibia in South West Africa. Presumably that distribution occurred because the plant was being cultivated for nicotine or perfume production.
So if all that the tests show is that that the mummies contained nicotine, consider me unsurprised. Since we have fairly solid evidence that tobacco was being grown for nicotine production in Southern Africa and right across the Pacific, it is not really all that shocking that it was traded as far afield as Egypt. It may even have been cultivated there, but since become extinct. Not all that surprising.
Now if DNA analysis had shown that the plant was N. tabacum that might mean something. But the mere presence of nicotine is not surprising since we know that the genus *Nicotiana *has been growing in Africa for millennia.
Much the same applies to cocaine. There are a couple of hundred species of Erythroxylum, and about 50 of them are found outside South America, from Southern Australia through to India and Southern Africa. All species contain a variety alkaloids and all seem to have been used by local people as drugs. Most of the species contain cocaine So once again, unless genetic tests have confirmed the presence of E. coca, all that we have is evidence that plants from Southern Africa or India were finding their way to Egypt. Not really a staggering revelation. The plants may even have been cultivated in Egypt.