Question What is the primary psychoactive component in marijuana? Answers THC TMJ MRT AAP Explanation The main psychoactive substance in marijuana is called tetrahydrocannabinol, or THC. This questions appears in the following tests: Minnesota Motorcycle Practice Test 9 Colorado Motorcycle Practice Test 3 Connecticut Motorcycle Practice Test 15 District Of Columbia Motorcycle Practice Test 17 Iowa Motorcycle Practice Test 19 Maine Motorcycle Practice Test 48 Massachusetts Motorcycle Practice Test 15 Montana Motorcycle Practice Test 14 Nevada Motorcycle Practice Test 12 New Hampshire Motorcycle Practice Test 14 New Jersey Motorcycle Practice Test 33 New Mexico Motorcycle Practice Test 11 North Dakota Motorcycle Practice Test 20 Oregon Motorcycle Practice Test 6 Texas Motorcycle Practice Test 18 Vermont Motorcycle Practice Test 14 West Virginia Motorcycle Practice Test 14