Final answer:
Marijuana is the most widely used illicit drug on college campuses, known for its psychoactive effects and high incidence of related legal offenses.
Step-by-step explanation:
The most widely used illicit drug on college campuses is marijuana. This psychoactive drug is known for altering consciousness and creating a sensation of euphoria. Despite fluctuations in its legal status in the United States, with some areas allowing recreational and/or medical use, marijuana remains a common choice among college students. It often leads to a high number of offenses reported by law enforcement, reflecting its widespread use despite legal restrictions. Other psychoactive drugs such as ecstasy, cocaine, and opioids have also been used recreationally, but their prevalence is outmatched by the popularity of marijuana on college campuses..