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Bouquot J, Schroeder K: Oral leukoplakia and smokeless tobacco keratoses are two separate and distinctive precancers

From Wikipedia I could find a study, prompted by certain phrases used by Shakespeare in the 16th/17th century, finding traces of cannabis in pipes buried in Shakespeare's home town: Why write I still all one, ever the same, And keep invention in a noted weed, Shakespeare, Sonnet 76 However, even if this does indicate that marijuana consumption wasn't unknown in England before Carroll's days (which it does very weakly) it still doesn't imply that Lewis Carroll himself smoked marijuana (despite extremely flaky claims such as the fifth paragraph here), or that he was familiar enough with the habit to insert it into his rather hallucinogenic fantasy world

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