answer:First, it’s halfling leaf – because the hobbits are also called halflings (being very short). Second, dropping eaves comes from eavesdropping. Samwise was saying (in his odd manner) that he hadn’t been listening in on the conversation. It has nothing to do with drugs at all. Third, yes, some do think that Gandalf’s leaf (or some of it) was a psychoactive drug of some kind. Perhaps like marijuana, perhaps not.