Which of the following behaviors may represent an indicator of cannabis use?

Difficulty in dividing attention is a recognized indicator of cannabis use because the substance can impair cognitive functioning and diminish a person's ability to focus on multiple tasks simultaneously. Cannabis affects the brain's processing capabilities, which can lead to challenges in maintaining attention and managing divided tasks effectively.

In contrast, piloerection (the hair standing on end) is typically notable in response to cold or strong emotions but is not a common indicator of cannabis use. Constipation may occur due to various factors, including other substances but is not specifically associated with cannabis. Excessive alertness is more commonly associated with stimulants rather than depressants like cannabis, which usually leads to a sense of relaxation or sedation. Therefore, difficulty in dividing attention is the most fitting behavior to indicate potential cannabis use.