Quiz: Marijuana Concentrates JustThinkTwice.gov sent this bulletin at 07/17/2020 03:23 PM EDT View as a webpage / Share Quiz: Marijuana Concentrates How much do you know about marijuana concentrates? Test your knowledge about the substance while learning more about its effect on the body. Take the quiz. Justthinktwice.com is a United States Government, Drug Enforcement Administration (DEA) website. The inclusion of a link on this website does not constitute an official endorsement, guarantee, or approval by DEA.
