Eich et al. (1975) examined the influence of marijuana on people's memory.He found that:

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Eich et al. (1975) found evidence supporting the concept of state-dependent learning, which suggests that information learned in a particular state (e.g., under the influence of marijuana) is more easily recalled when in that same state. This does not mean marijuana enhances memory overall, but rather that the congruence of internal states during learning and recall can affect memory performance.

Eich Et Al