how long after using does cannabis negatively affect the user’s attention, memory, and learning?

The negative effects of cannabis on attention, memory, and learning can begin acutely during intoxication and may persist after use. Residual cognitive effects often last for about 2 to 4 weeks after abstinence from cannabis. Heavy or chronic cannabis use, especially with lifetime use over 1,000 times, is associated with longer-term and potentially more persistent impairments in working memory, attention, and learning task performance. These effects can remain even after recent use is ceased and may involve neural adaptations in brain regions involved in working memory. For younger users, such as adolescents, these effects might be more pronounced and potentially longer lasting due to interference with brain development. However, exact durations may vary depending on use patterns and individual differences. Some withdrawal symptoms and cognitive impairments may also persist for about a week or more after stopping heavy use, which can further affect cognitive function during that period.