Which symptom is likely to occur with excessive cannabis use?

Excessive cannabis use is often associated with severe apathy, which encompasses a lack of motivation, reduced energy, and decreased interest in activities. This condition can occur due to the sedative and psychoactive effects of cannabis, particularly when used in high amounts. Users may experience a diminished ability to engage in tasks that were once enjoyable or necessary, leading to significant impairments in daily functioning.

The other symptoms provided in the options do not align with the typical outcomes of excessive cannabis use. Heightened concentration is not commonly associated with this substance, as many users report difficulties in focus or memory instead. Increased appetite, frequently referred to as "the munchies," is a known effect of cannabis but does not typically relate to excessive use resulting in severe dysfunction. Similarly, cannabis can lead to an increased heart rate, rather than a lower one, especially upon initial use, particularly in new users or with high THC concentrations.