CHICAGO (AP) – Parents worried about campus temptations as they drop their children off at college may want to note the findings of a new government report. Some illicit drugs pose the greatest attraction around exam time.

The report, released Thursday by the Substance Abuse and Mental Health Services Administration, finds college students are most likely to first try marijuana, inhalants and alcohol during the summer months, not during the school year. Underage college students were most likely to have their first alcoholic drink in June.

November, December and April were the most common months for students to first use stimulants for non-medical reasons, perhaps thinking drugs like Adderall and Ritalin will help them ace the tests. But there’s no medical evidence that such drugs enhance performance and they can be addictive.