One of the oldest texts ever found is the Ebers Papyrus. It was written somewhere around 1550 BC and is one of the oldest finished medical textbooks to have been found so far.
It mentions a number of formulas which make use of cannabis IE, hemp. It was commonly used to alleviate pain and inflammation caused by numerous diseases and injuries.
Women in particular used marijuana to ward off depression and other psychological problems in early Egypt.
The oldest medicinal use of the herb in the region may date back even further, to 2000 BC, when it might have been used to treat glaucoma, cataracts, hemorrhoids, vaginal bleeding and yes, even cancer. Cannabis was probably not a cure, but used to lessen the symptoms mostly. Modern Science is just starting to look more in depth into this plant. We are only beginning to verify the fact that cannabis has some truly amazing pain-relieving properties. It is a very potent calming agent for the imbalanced central nervous systems of patients suffering from Parkinson’s Disease and many other illness's.
Yes they have also found traces of Cannabis in Egyptian Tombs and in their Artwork, Religion and Culture
In 1881 the mummy of Pharaoh Ramesses II was discovered and when his tomb was finally opened in 1995 traces of cannabis were found in his tomb. That was the last thing anyone was expecting, but there it was.
Since then, a lot of the uncovered mummies have shown similar traces of Cannabis and even other drugs such as Cocaine and Opium, confirming the suspicion that indeed cannabis and other drugs were already a part of the regular culture in ancient Egypt.
In ancient Egypt there is a fair amount of artwork that depicts what looks to be cannabis, showing it being used for medicinal, religious and cultural purposes.
Seshat, the goddess of wisdom and Bastet, the feline goddess of war were often depicted with a leaf of the cannabis plant in paintings of them from thousands of years ago. Bastet, the goddess of war, was depicted using cannabis but more for witchcraft.
There is also evidence suggesting that ancient worshipper's may have been consuming marijuana in one form or the other during their religious festivities and rituals.
They have also found Cannabis, in its digestible form in tombs in the Turpan District of Xinjiang, China that date back 2000s to 2500 years ago via carbon-dating. Mankind's use may date back even farther than 12,000 years ago.
Carl Sagan in his book “Dragons of Eden”, Carl Sagan speculated that marijuana may have been the first crop planted by Stone Age Man, using the Pygmies as an example. The Pygmies were basically hunter-gatherers until they started planting marijuana, which they use for religious purposes.
In defense of the Pygmies, perhaps I should note that a friend who has spent time with them says that for such activities as the patient stalking and hunting of mammals and fish, they prepare themselves through marijuana intoxication, which helps to make the long waits, boring to anyone further evolved than a Komodo dragon, at least moderately tolerable. Ganja is their only cultivated crop. It would be wryly interesting if in human history, the cultivation of marijuana led generally to the invention of agriculture, and thereby to civilization.”Carl Sagan