Which symptom is associated with marijuana usage?

Marijuana usage is commonly associated with an altered sense of time. Users often report the experience of time moving slower than it actually does, which can affect their perception of events and activities. This symptom is part of the broader range of cognitive and sensory alterations that can occur with marijuana use, including changes in visual and auditory perception.

The other options, such as increased focus, heightened alertness, and improved reflexes, do not accurately represent the typical effects of marijuana. Instead, marijuana can lead to decreased reaction times and impairments in attention and focus, which is contrary to the suggestions of those other symptoms. Understanding how marijuana influences perception is crucial for recognizing its potential impact on activities such as driving or operating machinery, where an altered sense of time could lead to dangerous situations.