"They contained, as I guessed very early on, some fragrant French tobacco that was mixed with hashish"
Hashish
Public DomainHashish - Credit: U.S. Federal Government

 Hashish is a paste-like substance, usually light to dark brown in colour, which is made from the cannabis plant.

Like other preparations of cannabis, it is used as a recreational drug for its psychoactive effects; it may be smoked in joints (mixed with tobacco or herbs) or in pipes, or cooked in food.

During the 19th Century, hashish was used by the poets, Charles Baudelaire, Arthur Rimbaud and Pierre Gautier (often known as Théophile Gautier); both Gautier and Baudelaire were members of the Paris-based group known as the Club des Hashischins, who experimented with hashish use between 1844 and 1849.

Cannabis preparations were available for medicinal use in 19th Century Britain, and could be obtained without a prescription.