“Research suggests that daily cannabis users have impaired memory for past events, but it is not clear whether they are also impaired in prospective memory (PM) for future events.

The present study examined PM in daily cannabis users who were either dependent or non-dependent, and compared them with non-using controls.

Findings suggest that when carefully matched on baseline variables, and not differing in premorbid IQ or alcohol use, young, near-daily cannabis users do not differ from non-using controls in PM performance.”

https://www.ncbi.nlm.nih.gov/pubmed/29636705

https://www.frontiersin.org/articles/10.3389/fpsyt.2018.00097/full