The oldest written record of the medicinal use of cannabis was from the Chinese Emperor Shen Nung in 2727 B.C. The oldest known human usage of cannabis comes from a hemp rope dating back to 26,900 BC which was found in Czechoslovakia in 1997.
No one had their beiber stuned by the uses of cannabis 2,000 years ago. LOL
Its just a useful plant. Its no big deal.