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Brief description marijuana is a dry, shredded green and brown mix of leaves, flowers, stems, and seeds from the hemp plant cannabis sativa. in a more concentrated, resinous form, it is called hashish, and as a sticky black liquid, hash oil. the main psychoactive (mind-altering) chemical in marijuana is delta-9-tetrahydrocannabinol, or thc. learn more about marijuana also more about: marijuana research at nida. nida's role in providing marijuana for research statistics and trends swipe left or right to scroll. monitoring the future study: trends in prevalence of marijuana/ hashish for 8th graders, 10th graders, and 12th graders; 2013 (in percent)* drug time period 8th graders 10th graders 12th graders marijuana/ hashish lifetime 16.50 35.80 45.50 past year 12.70 29.80 36.40 past month 7.00 18.00 22.70 daily 1.10 4.00 6.50 * data in brackets indicate statistically significant change from the previous year. previous mtf data swipe left or right to scroll. national survey on drug use and health: trends in prevalence of marijuana/ hashish for ages 12 or older, ages 12 to 17, ages 18 to 25, and ages 26 or older; 2012 (in percent)* drug time period ages 12 or older ages 12 to 17 ages 18 to 25 ages 26 or older marijuana/ hashish lifetime 42.80 17.00 52.20 44.40 past year [12.10] 13.50 31.50 [8.60] past month 7.30 [7.20] 18.70 5.30 ^ indicate low precision; no estimate reported. data in brackets indicate statistically significant change from the previous year. previous nsduh data latest science nida tv spotlight on doctors judith and david brooks: risks and consequences of drug abuse (august 2013) message from the nida director - challenging marijuana myths (february 2013) message from the nida director - marijuana’s lasting effects on the brain, (january 2013) |