Did they smoke marijuana in Rome?

In ancient Rome, the use of marijuana (or cannabis) was not common in the same way it is understood today. However, there is evidence that hemp was known and used in various forms. Hemp fibers were used for making ropes, sails, and textiles, and its seeds were sometimes used in cooking or as a medicinal herb.

As for psychoactive uses of cannabis, there are some historical accounts that suggest the possibility, though the direct evidence of marijuana smoking is sparse.