Could a rose by another name be a pot plant?

An analysis of 17th-century tobacco pipes dug up from William Shakespeare's garden in Stratford-upon-Avon found indications of cannabis along with nicotine, according to the South African Journal of Science.

The study's author, Professor Francis Thackeray of the Evolutionary Studies Institute at University of the Witwatersrand in Johannesburg, South Africa, says that while there's no hard evidence The Bard smoked pot or even owned the pipes, he notes one Shakespearean sonnet references "invention in noted weed."

"I think that Shakespeare was playing with words and (it) is probably a cryptic reference to cannabis," Thackeray tells CNN.